APA (7th ed.) Citation

Zuber Usman, H. D. (1977). Khalifah Pertama: Abu Bakar Siddik. Penerbit Widjaya.

Chicago Style (17th ed.) Citation

Zuber Usman, H. Drs. Khalifah Pertama: Abu Bakar Siddik. Jakarta: Penerbit Widjaya, 1977.

MLA (9th ed.) Citation

Zuber Usman, H. Drs. Khalifah Pertama: Abu Bakar Siddik. Penerbit Widjaya, 1977.

Warning: These citations may not always be 100% accurate.