Παραπομπή APA

Yahwant Singh Hartta. (2011). Sustainable agricultural development. Regal.

Παραπομπή Chicago Style

Yahwant Singh Hartta. Sustainable Agricultural Development. ND: Regal, 2011.

Παραπομπή MLA

Yahwant Singh Hartta. Sustainable Agricultural Development. Regal, 2011.