Washington Native Plant Society. (1983). Douglasia occasional papers. The Society.
Cita Chicago Style (17a ed.)Washington Native Plant Society. Douglasia Occasional Papers. [Seattle, Wash.]: The Society, 1983.
Cita MLA (8a ed.)Washington Native Plant Society. Douglasia Occasional Papers. The Society, 1983.
Precaución: Estas citas no son 100% exactas.