Gaya APA
Nasution, A, B., Siregar, R, H. (2016).
AKHLAK TASAWUF (ED. 2-CET. 3.).
Jakarta:
PT Rajagrafindo Persada.
Gaya MLA
Nasution, Ahmad, Bangun., Siregar, Rayani, Hanum.
"AKHLAK TASAWUF".
ED. 2-CET. 3.
Jakarta:
PT Rajagrafindo Persada,
2016.
Text.