APA (7th ed.) Citation

Beigel, R., Kummer, M., & Stephan, F. (1993). Approximable sets.

Chicago Style (17th ed.) Citation

Beigel, Richard, Martin Kummer, and Frank Stephan. Approximable Sets. Amsterdam, 1993.

MLA (9th ed.) Citation

Beigel, Richard, et al. Approximable Sets. 1993.