APA (7th ed.) Zitazioa

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 Style (17th ed.) Zitazioa

Johnson, V. A., eta 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 (9th ed.) Zitazioa

Johnson, V. A., eta P. J. Mattern. Genetic Improvement of Productivity and Nutritional Quality of Wheat. Annual Report. A.I.D. R & D Report Distribution Center, 1977.