APA Citation

Nasution, A. K., & Siregar, B. (1957). Ilmu alam.

Chicago Style Citation

Nasution, A. Kadir, and Bermawi Siregar. Ilmu Alam. 1957.

MLA Citation

Nasution, A. Kadir, and Bermawi Siregar. Ilmu Alam. 1957.

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