Παραπομπή σε μορφή APA (7η εκδ.)

Petavel , J. W. (1921). Non co- operation and the bread problem : the first lecture of a series delivers to Calcutta: Calcutta University. Calcutta univ. pr.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Petavel , J W. Non Co- Operation and the Bread Problem : The First Lecture of a Series Delivers to Calcutta: Calcutta University. Calcutta: Calcutta univ. pr, 1921.

Παραπομπή σε μορφή MLA (9th εκδ.)

Petavel , J W. Non Co- Operation and the Bread Problem : The First Lecture of a Series Delivers to Calcutta: Calcutta University. Calcutta univ. pr, 1921.