Παραπομπή σε μορφή APA (7η εκδ.)

Fischel, W. J. (1964). William Popper (1874-1963) and his contribution to islamic scholarship: In memoriam / by Walter J. Fischel.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Fischel, Walter J. William Popper (1874-1963) and His Contribution to Islamic Scholarship: In Memoriam / by Walter J. Fischel. 1964.

Παραπομπή σε μορφή MLA (8th εκδ.)

Fischel, Walter J. William Popper (1874-1963) and His Contribution to Islamic Scholarship: In Memoriam / by Walter J. Fischel. 1964.