Forero, Manuela G., and Keith A. Hobson. “Using Stable Isotopes of Nitrogen and Carbon to Study Seabird Ecology: Applications in the Mediterranean Seabird Community”. Scientia Marina 67, no. S2 (July 30, 2003): 23–32. Accessed March 28, 2024. https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/538.