Cita APA (7a ed.)

Heath, M. E., Metcalfe, D. S., & Barnes, R. F. (1973). Forages: The science of grassland agriculture (3rd. ed.). Iowa State University Press.

Cita Chicago Style (17a ed.)

Heath, Maurice E., Darrel S. Metcalfe, y Robert F. Barnes. Forages: The Science of Grassland Agriculture. 3rd. ed. Iowa: Iowa State University Press, 1973.

Cita MLA (8a ed.)

Heath, Maurice E., et al. Forages: The Science of Grassland Agriculture. 3rd. ed. Iowa State University Press, 1973.