Gaya APA

Baktsir, A, A., Mahdamy, A. (1987). Sejarah Serial Kpemimpinan Umar . Solo: Pustaka Mantiq.

Gaya MLA

Baktsir, Ali, Ahmad., Mahdamy, Abdulkadir. "Sejarah Serial Kpemimpinan Umar ". Solo: Pustaka Mantiq, 1987. Text.