-. (1990). Krisis Biologi: Hilangnya Keanekaragaman Biologi. Yayasan Obor Indonesia.
Chicago Style (17th ed.) Citation-. Krisis Biologi: Hilangnya Keanekaragaman Biologi. Yayasan Obor Indonesia, 1990.
MLA (8th ed.) Citation-. Krisis Biologi: Hilangnya Keanekaragaman Biologi. Yayasan Obor Indonesia, 1990.
Warning: These citations may not always be 100% accurate.