'Asyur, S. M., & Nurul Hikmah. (1999). Menyingkap rahsia alam malaikat. Thinker 's Library.
Chicago Style (17th ed.) Citation'Asyur, Sheikh Mustafa, and Nurul Hikmah. Menyingkap Rahsia Alam Malaikat. Selangor: Thinker 's Library, 1999.
MLA (8th ed.) Citation'Asyur, Sheikh Mustafa, and Nurul Hikmah. Menyingkap Rahsia Alam Malaikat. Thinker 's Library, 1999.
Warning: These citations may not always be 100% accurate.