APA-referens

Gupta , P. .. K. (1999). Soil , plant , water and fertilizer analysis. Agro botanica.

Chicago-stil citat

Gupta , P . K. Soil , Plant , Water and Fertilizer Analysis. New Delhi: Agro botanica, 1999.

MLA-referens

Gupta , P . K. Soil , Plant , Water and Fertilizer Analysis. Agro botanica, 1999.