Não informado. (2018). Proceedings of the Portland Society of Natural History. Portland Society of Natural History.
Chicago-viite (17. p.)Não informado. Proceedings of the Portland Society of Natural History. Portland, Me: Portland Society of Natural History, 2018.
MLA-viite (8. p.)Não informado. Proceedings of the Portland Society of Natural History. Portland Society of Natural History, 2018.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.