'Asyur, S. M., & Nurul Hikmah. (1999). Menyingkap rahsia alam malaikat. Thinker's Library Sdn Bhd.
Chicago Style (17th ed.) Citation'Asyur, Sheikh Mustafa, and Nurul Hikmah. Menyingkap Rahsia Alam Malaikat. Batu Caves: Thinker's Library Sdn Bhd, 1999.
MLA (9th ed.) Citation'Asyur, Sheikh Mustafa, and Nurul Hikmah. Menyingkap Rahsia Alam Malaikat. Thinker's Library Sdn Bhd, 1999.
Warning: These citations may not always be 100% accurate.