Παραπομπή APA

Upadhyay, D. (1987). Productivity. N.P.C.

Παραπομπή Chicago Style

Upadhyay, D.P. Productivity. N.P.C, 1987.

Παραπομπή MLA

Upadhyay, D.P. Productivity. N.P.C, 1987.