APA

Gilkey H. M., Steward A. N. & Johnston L. D. (. R. D. (1963). Aquatic plants of the Pacific Northwest with vegetative keys. Corvallis, Oregon: Oregon State University Press.

Chicago

Gilkey Helen M, Steward Albert N and Johnston L D (la Rea Dennis). 1963. Aquatic plants of the Pacific Northwest with vegetative keys. Corvallis, Oregon: Oregon State University Press.

Harvard

Gilkey H. M., Steward A. N. and Johnston L. D. (. R. D. (1963). Aquatic plants of the Pacific Northwest with vegetative keys. Corvallis, Oregon: Oregon State University Press.

MLA

Gilkey Helen M, Steward Albert N and Johnston L D (la Rea Dennis). Aquatic plants of the Pacific Northwest with vegetative keys. Corvallis, Oregon: Oregon State University Press. 1963.