Whitlock, F. L. (1918). Notes on north-western birds. Zenodo.
Citazione stile Chigago Style (17a edizione)Whitlock, F Lawson. Notes on North-western Birds. Zenodo, 1918.
Citatione MLA (9a ed.)Whitlock, F Lawson. Notes on North-western Birds. Zenodo, 1918.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.