APA (7th ed.) Citation

GHUFRON, A. Mengetuk pintu surga. Aulia Press.

Chicago Style (17th ed.) Citation

GHUFRON, Ali. Mengetuk Pintu Surga. Aulia Press.

MLA (8th ed.) Citation

GHUFRON, Ali. Mengetuk Pintu Surga. Aulia Press.

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