APA (7th ed.) Citation

Engquist, B., & Schmid, W. (2001). Mathematics unlimited: 2001 and beyond (Collector's ed.). Springer.

Chicago Style (17th ed.) Citation

Engquist, Björn, and Wilfried Schmid. Mathematics Unlimited: 2001 and Beyond. Collector's ed. Berlin ; New York: Springer, 2001.

MLA (8th ed.) Citation

Engquist, Björn, and Wilfried Schmid. Mathematics Unlimited: 2001 and Beyond. Collector's ed. Springer, 2001.