Não informado. (2018). Report of Progress. Geological and Natural History Survey of Canada.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Report of Progress. Toronto, Canada: Geological and Natural History Survey of Canada, 2018.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Report of Progress. Geological and Natural History Survey of Canada, 2018.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.