Sánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
芝加哥风格引文Sánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
MLA引文Sánchez-Villagra. Urumaco and Venezuelan Paleontology. Indiana University Press.
警告：这些引文格式不一定是100％准确.