If your article is acceptable in a biannual journal and you have to cite the same in other journal which is monthly.so if you cite your biannual may be citation appear before publication. Kindly suggest
It depends if your paper is acceptable or it is already accepted to the biannual journal. If it was accepted , but will appear later in the year, you may cite it and in the bibliography you could write "forthcoming" next to the bibliographic details.
Anjay, by the time the proofs are ready, you might be able to update the relevant reference – if you did indeed mean that the paper has been accepted. You could also ask the journal editor how you should cite the forthcoming paper, doing this within a few days of the time at which the proofs will be returned as you might obtain a volume and issue number this way. The latter would enable you to write "To be published in [journal name, including the volume, edition & year]". Don't forget the value of repositories, though: "Accepted for publication in [journal name]" with a link to the version stored in a repository would be useful for those wishing to cite you as they can find the manuscript (possibly in an earlier version) and cite the published paper correctly if they wish to do so. For a paper that has only been submitted, but has yet to be accepted, you might provide a link to the repository and write forthcoming.
As suggested earlier for self citation can be done by writing unpublished or forthcoming if accepted depending upon the format of journal that is going to submit