Παραπομπή APA

Sonal singh. (1998). Universe of knowledge: Structure and development (1st.). Raj.

Παραπομπή Chicago Style

Sonal singh. Universe of Knowledge: Structure and Development. 1st. Jaipur: Raj, 1998.

Παραπομπή MLA

Sonal singh. Universe of Knowledge: Structure and Development. 1st. Raj, 1998.