Steward, A. N. (1960). Aquatic plants of the Pacific Northwest: With vegetative keys. Oregon State College.
Cita Chicago Style (17a ed.)Steward, Albert Newton. Aquatic Plants of the Pacific Northwest: With Vegetative Keys. Corvallis: Oregon State College, 1960.
Cita MLA (8a ed.)Steward, Albert Newton. Aquatic Plants of the Pacific Northwest: With Vegetative Keys. Oregon State College, 1960.
Precaución: Estas citas no son 100% exactas.