Cita APA (7a ed.)

Hughes, H. D., Heath, M. E., & Metcalfe, D. S. Forages; the science of grassland agriculture. Iowa State College Press.

Cita Chicago Style (17a ed.)

Hughes, Harold D., Maurice E. Heath, y Darrel S. Metcalfe. Forages; the Science of Grassland Agriculture. Ames: Iowa State College Press.

Cita MLA (8a ed.)

Hughes, Harold D., et al. Forages; the Science of Grassland Agriculture. Iowa State College Press.