Não informado. (1841). Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1841.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia, 1841.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.