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Head، Jason J.؛ Jonathan I. Bloch؛ Alexander K. Hastings؛ Jason R. Bourque؛ Edwin A. Cadena؛ Fabiany A. Herrera؛ P. David Polly؛ Carlos A. Jaramillo (2009). "Giant boid snake from the paleocene neotropics reveals hotter past equatorial temperatures". Nature. ج. 457 ع. 7230: 715–718. DOI:10.1038/nature07671. PMID:19194448.
Baucon, A. 2010. Leonardo da Vinci, the founding father of ichnology. Palaios 25. Abstract available from the author's homepageنسخة محفوظة 2022-08-08 على موقع واي باك مشين.
Baucon, A. 2010. Leonardo da Vinci, the founding father of ichnology. Palaios 25. Abstract available from the author's homepageنسخة محفوظة 2022-08-08 على موقع واي باك مشين.