Παραπομπή σε μορφή APA (7η εκδ.)

SpringerLink (Online service), Engin, A., & Engin, A. B. (2015). Tryptophan Metabolism: Implications for Biological Processes, Health and Disease. Springer International Publishing : Imprint: Humana Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

SpringerLink (Online service), Atilla Engin, και Ayse Basak Engin. Tryptophan Metabolism: Implications for Biological Processes, Health and Disease. Cham: Springer International Publishing : Imprint: Humana Press, 2015.

Παραπομπή σε μορφή MLA (8th εκδ.)

SpringerLink (Online service), et al. Tryptophan Metabolism: Implications for Biological Processes, Health and Disease. Springer International Publishing : Imprint: Humana Press, 2015.