Παραπομπή APA

Gupta, P. K. (2004). Vermicomposting for sustainable agriculture.

Παραπομπή Chicago Style

Gupta, P K. Vermicomposting for Sustainable Agriculture. Jodhpur, Agrobios, 2004.

Παραπομπή MLA

Gupta, P K. Vermicomposting for Sustainable Agriculture. 2004.