APA (7th ed.) Citation

SpringerLink (Online service), Berggren, L., Borwein, J. M., & Borwein, P. B. (1997). Pi, a source book. Springer.

Chicago Style (17th ed.) Citation

SpringerLink (Online service), Lennart Berggren, Jonathan M. Borwein, and Peter B. Borwein. Pi, a Source Book. New York: Springer, 1997.

MLA (9th ed.) Citation

SpringerLink (Online service), et al. Pi, a Source Book. Springer, 1997.