APA (7th ed.) Citation

Sumardi, Y. (2017). Ilmu Kebumian. UNY Press.

Chicago Style (17th ed.) Citation

Sumardi, Yosaphat. Ilmu Kebumian. UNY Press, 2017.

MLA (8th ed.) Citation

Sumardi, Yosaphat. Ilmu Kebumian. UNY Press, 2017.

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