When ResearchGate imports data from other sources, rather often the result is not perfect, especially for books. Your book is wrongly listed as "Article": https://www.researchgate.net/publication/44481416. You should change the type to "Book" and add the missing data (publisher, ISBN, etc.). See "How do I edit my research item's details?" in https://help.researchgate.net/hc/en-us/articles/14293081125777-Reviewing-editing-and-featuring-your-research for instructions. By the way, ResearchGate lists also a review of your book: https://www.researchgate.net/publication/256254637