APA (7th ed.) Citation

Steinbeck, J., & Muhammad Ridwan. (1981). Perjuangan sia-sia. DBP.

Chicago Style (17th ed.) Citation

Steinbeck, John, and Muhammad Ridwan. Perjuangan Sia-sia. Kuala Lumpur: DBP, 1981.

MLA (8th ed.) Citation

Steinbeck, John, and Muhammad Ridwan. Perjuangan Sia-sia. DBP, 1981.

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