APA (7th ed.) Citation

Schaller, L. E. (1994). 21 bridges to the 21st century. Abingdon Press.

Chicago Style (17th ed.) Citation

Schaller, Lyle E. 21 Bridges to the 21st Century. Nashville: Abingdon Press, 1994.

MLA (9th ed.) Citation

Schaller, Lyle E. 21 Bridges to the 21st Century. Abingdon Press, 1994.