APA (7th ed.) Citation

Mooney, H. A., Mooney, H. A., & Sombroek, W. G. (1991). The terrestrial system. ASCEND 21.

Chicago Style (17th ed.) Citation

Mooney, H. A., Harold A. Mooney, and Wim G. Sombroek. The Terrestrial System. Vienna, Austria: ASCEND 21, 1991.

MLA (9th ed.) Citation

Mooney, H. A., et al. The Terrestrial System. ASCEND 21, 1991.