Cita APA (7a ed.)

Willems, N., & Lucas, W. M. (1978). Structural analysis for engineers. McGraw-Hill.

Cita Chicago Style (17a ed.)

Willems, Nicholas, y William M. Lucas. Structural Analysis for Engineers. New York: McGraw-Hill, 1978.

Cita MLA (8a ed.)

Willems, Nicholas, y William M. Lucas. Structural Analysis for Engineers. McGraw-Hill, 1978.