Gray, P. H. H. (1967). Some Biometrics in Pieris and Colias (Lepidoptera: Pieridae) in Quebec and Nova Scotia. Zenodo.
Cita Chicago (17th ed.)Gray, Percy Heath Hobart. Some Biometrics in Pieris and Colias (Lepidoptera: Pieridae) in Quebec and Nova Scotia. Zenodo, 1967.
Cita MLA (9th ed.)Gray, Percy Heath Hobart. Some Biometrics in Pieris and Colias (Lepidoptera: Pieridae) in Quebec and Nova Scotia. Zenodo, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.