Washington State Horticultural Association, Washington State Horticultural Association, Washington State Horticultural Association, & Washington State Horticultural Association. Proceedings, annual meeting - Washington State Horticultural Association. Washington State Horticultural Association.
Style de citation Chicago (17e éd.)Washington State Horticultural Association, Washington State Horticultural Association, Washington State Horticultural Association, et Washington State Horticultural Association. Proceedings, Annual Meeting - Washington State Horticultural Association. Wenatchee, Wash.: Washington State Horticultural Association.
Style de citation MLA (8e éd.)Washington State Horticultural Association, et al. Proceedings, Annual Meeting - Washington State Horticultural Association. Washington State Horticultural Association.