Não informado. (1841). Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia.
Chicago-Zitierstil (17. Ausg.)Não informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1841.
MLA-Zitierstil (8. Ausg.)Não informado. Proceedings of the Academy of Natural Sciences of Philadelphia. Academy of Natural Sciences of Philadelphia, 1841.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.