APA (7th ed.) Citation

Siregar, I. Z., Yunanto, T., & Ratnasari, J. (2009). Kayu Sengon. Penebar Swadaya.

Chicago Style (17th ed.) Citation

Siregar, Iskandar Z., Tedi Yunanto, and Juwita Ratnasari. Kayu Sengon. Penebar Swadaya, 2009.

MLA (8th ed.) Citation

Siregar, Iskandar Z., et al. Kayu Sengon. Penebar Swadaya, 2009.