Sánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
Chicago Style (17th ed.) CitationSánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
MLA引文Sánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
警告：這些引文格式不一定是100％准確.