Hjort, Randy Carl, and Carl B. Schreck. "Phenotypic differences among stocks of hatchery and wild coho salmon, Oncorhynchus kisutch, in Oregon, Washington, and California." Fishery Bulletin 80, no. 1 (1982): p.105-119.

Hjort, Randy Carl. Phenotypic Comparison of Hatchery and Wild Coho Salmon (<i>Oncorhynchus kisutch) in Oregon, Washington, and California</i>. M. S. ed. Corvallis, Or.: Oregon State University, 1979.