Cita APA (7a ed.)

Bockman, O. C., Kaarstad, O., Lie, O. H., & Richards, I. (1990). Agriculture and fertilizers: Fertilizers in perspective their role in feeding the world, environmental challenges, are there alternatives. Norsk Hydro.

Cita Chicago Style (17a ed.)

Bockman, Oluf Chr, Ola Kaarstad, Ole H. Lie, y Ian Richards. Agriculture and Fertilizers: Fertilizers in Perspective Their Role in Feeding the World, Environmental Challenges, Are There Alternatives. Oslo: Norsk Hydro, 1990.

Cita MLA (8a ed.)

Bockman, Oluf Chr, et al. Agriculture and Fertilizers: Fertilizers in Perspective Their Role in Feeding the World, Environmental Challenges, Are There Alternatives. Norsk Hydro, 1990.