Virginia Polytechnic Institute and State University & Virginia Agricultural Experiment Station. (1981). Bulletin. Virginia Polytechnic Institute and State University.
Citace podle Chicago (17th ed.)Virginia Polytechnic Institute and State University a Virginia Agricultural Experiment Station. Bulletin. Blacksburg: Virginia Polytechnic Institute and State University, 1981.
Citace podle MLA (8th ed.)Virginia Polytechnic Institute and State University a Virginia Agricultural Experiment Station. Bulletin. Virginia Polytechnic Institute and State University, 1981.
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