Johnson, V. A., & Mattern, P. J. (1977). Genetic improvement of productivity and nutritional quality of wheat. Annual report. A.I.D. R & D Report Distribution Center.
Chicago-čujuhus (17. p.)Johnson, V. A., juo P. J. Mattern. Genetic Improvement of Productivity and Nutritional Quality of Wheat. Annual Report. Ann Arbor: A.I.D. R & D Report Distribution Center, 1977.
MLA-čujuhus (9. p.)Johnson, V. A., juo P. J. Mattern. Genetic Improvement of Productivity and Nutritional Quality of Wheat. Annual Report. A.I.D. R & D Report Distribution Center, 1977.
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