Gaya APA

Umar wa khalid. (1970). Laeden: [s.n.].

Gaya Chicago

Umar wa khalid. Cet. 1. Laeden: [s.n.], 1970. Text.

Gaya MLA

Umar wa khalid. Cet. 1. Laeden: [s.n.], 1970. Text.

Gaya Turabian

Umar wa khalid. Laeden: [s.n.], 1970. Print.