APA-referens (7:e uppl.)

Barker, R., Mangahas, M., & Meyers, W. H. (1976). The probable impact of the seed-fertilizer revolution on grain production and on farm labor requirements [microform]. Photoduplication Service, University of the Philippines Library.

Chicago-referens (17:e uppl.)

Barker, Randolph, Mahar Mangahas, och William H. Meyers. The Probable Impact of the Seed-fertilizer Revolution on Grain Production and on Farm Labor Requirements [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.

MLA-referens (9:e uppl.)

Barker, Randolph, et al. The Probable Impact of the Seed-fertilizer Revolution on Grain Production and on Farm Labor Requirements [microform]. Photoduplication Service, University of the Philippines Library, 1976.