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.
Citazione stile Chigago Style (17a edizione)Johnson, V. A., e 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.
Citatione MLA (9a ed.)Johnson, V. A., e P. J. Mattern. Genetic Improvement of Productivity and Nutritional Quality of Wheat. Annual Report. A.I.D. R & D Report Distribution Center, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.