APA (7th ed.) Citation

Aleksandrova, L. P., & Spivak, I. A. (1989). The Urgent Problems.

Chicago Style (17th ed.) Citation

Aleksandrova, L. P., and I. A. Spivak. The Urgent Problems. 1989.

MLA (8th ed.) Citation

Aleksandrova, L. P., and I. A. Spivak. The Urgent Problems. 1989.

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