Não informado. (2018). Proceedings of the Portland Society of Natural History. Portland Society of Natural History.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Proceedings of the Portland Society of Natural History. Portland, Me: Portland Society of Natural History, 2018.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Proceedings of the Portland Society of Natural History. Portland Society of Natural History, 2018.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.