Citing sources correctly is an important aspect of academic writing, as it allows readers to locate and verify the information you have used in your work. While it is generally recommended to use the correct citation format, such as using the acronym WCED for the World Commission of Environment and Development, it is best to consult your university's specific guidelines or consult with your supervisor to determine the preferred citation format for your dissertation.

In terms of the grading, it ultimately depends on your university's policies and the preferences of your supervisor or department. Some universities may have strict guidelines regarding citation formatting, while others may be more lenient. It is possible that using an incorrect citation format may result in a deduction of marks, but the extent of the impact will likely depend on the significance of the mistake and the overall quality of your work.

To address the issue, you can consider the following steps:

Consult your university guidelines: Check your university's guidelines or dissertation handbook to see if they have specified a preferred citation format. This will help you determine if there are any specific requirements for citing the Brundtland Report.

Contact your supervisor: Reach out to your supervisor or advisor and explain the situation. They will be able to provide guidance on how to proceed and whether any changes need to be made to your citations.

Make corrections if necessary: If it is determined that your citations need to be corrected, you should make the necessary changes throughout your dissertation. This may involve updating the citation format to use the correct acronym (WCED) instead of the author's name (Brundtland) in subsequent references.

Consider the overall impact: While using the correct citation format is important, it is also important to consider the overall quality of your work. If the rest of your dissertation is well-researched and well-written, a minor citation error may not have a significant impact on your final grade. However, it is ultimately up to your supervisor or grading committee to determine how much weight to give to the citation issue.

Remember, it is always best to consult with your university and supervisor to ensure that you are following the correct citation guidelines and addressing any concerns they may have.

Is it wrong??? If is wrong, does it count a lot in the grading?

It seems the answer to your question is here (above statement by you), at least I think so.

Using excessive question marks and also "a lot in the grading". These two signs tell me you had done your job well but the result (grade) was not some thing you expected!

First, NO it is not wrong at all, your guide, supervisor (first one , second one) could ask you to correct it (according to your university guidelines) before submitting, after submitting and all before deciding your final grade on your thesis.

So my experience tells me, the answer might be hidden. I have seen or engaged in similar situations,

One of them, I remember from some 27 years ago that I used to work as a database librarian, two BS students were searching for an specific "fungal disease" in plants, after days of searching any related databases nothing found, it was there in all databases but not for plants but for animals, but their professor had asked it in plants, they lost grades, I am not to open it any more, but sometimes professors have their own ways to retaliate! (noisy students, challenging them, not being on time, ignoring deadlines...)

Also, In my PhD, my second and third advisors wanted more and more published papers from my dissertation with their names, I refused and they did what they could in viva! they were supposed to back me, before defense committee, but they backed them!

Is it moral? no not certainly, but if we compere the world of academia with "Maslow's pyramid of needs" some want to be there as professors, associate or full, but like Maslow pyramid, they have been stuck in the lowest part, they just want to be, they don't want to learn, they don't want to find new things in sciences, anything that does not match with their "own standards" may irritate them!

It is not wrong and you will not be graded down for it. It is better to quote authors if you can anyway :)