APA (7e ed.) Bronvermelding
Hibbard, C. W. (1955). Pleistocene Vertebrates from the upper becerra (Becerra superior) formation, valley of Tequixquiac, Mexico, with notes on other pleistocene forms.
Chicago (17e ed.) Bronvermelding
Hibbard, Claude W. Pleistocene Vertebrates from the Upper Becerra (Becerra Superior) Formation, Valley of Tequixquiac, Mexico, with Notes on Other Pleistocene Forms. Ann Arbor, 1955.
MLA (9e ed.) Bronvermelding
Hibbard, Claude W. Pleistocene Vertebrates from the Upper Becerra (Becerra Superior) Formation, Valley of Tequixquiac, Mexico, with Notes on Other Pleistocene Forms. 1955.
Let op: Deze citaties zijn niet altijd 100% accuraat.