Cita APA

Walther, R. A., & Walther, R. A. (2007). Bridge construction inspection course: Participant workbook. Washington, D.C.: National Highway Institute.

Citación estilo Chicago

Walther, Richard A., y Richard A. Walther. Bridge Construction Inspection Course: Participant Workbook. Washington, D.C.: National Highway Institute, 2007.

Cita MLA

Walther, Richard A., y Richard A. Walther. Bridge Construction Inspection Course: Participant Workbook. Washington, D.C.: National Highway Institute, 2007.