Παραπομπή APA

PN Kalla. (2006). Communication skills for extension workers. Agrotech publishing academy.

Παραπομπή Chicago Style

PN Kalla. Communication Skills for Extension Workers. Udaipur: Agrotech publishing academy, 2006.

Παραπομπή MLA

PN Kalla. Communication Skills for Extension Workers. Agrotech publishing academy, 2006.