APA (7th ed.) Citation

Ryadi, A. S. Pencemaran udara. Usaha Nasional.

Chicago Style (17th ed.) Citation

Ryadi, Al. Slamet. Pencemaran Udara. Usaha Nasional.

MLA (8th ed.) Citation

Ryadi, Al. Slamet. Pencemaran Udara. Usaha Nasional.

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