APA Style

Khalid, Khalid Muhammad. (2009). Di Hadapan Umar (Cet. 1). Yogyakarta: Mitra Pustaka.

Chicago Style

Khalid, Khalid Muhammad. Di Hadapan Umar. Cet. 1 Yogyakarta: Mitra Pustaka, 2009. Text.

MLA Style

Khalid, Khalid Muhammad. Di Hadapan Umar. Cet. 1 Yogyakarta: Mitra Pustaka, 2009. Text.

Turabian Style

Khalid, Khalid Muhammad. Di Hadapan Umar. Cet. 1 Yogyakarta: Mitra Pustaka, 2009. Print.