APA (7th ed.) Citation

Humar, J. L., & Wright, E. W. (1991). Directory of commercial computer software for civil engineering. The Canadian Society for Civil Engineering.

Chicago Style (17th ed.) Citation

Humar, J. L., and E. W. Wright. Directory of Commercial Computer Software for Civil Engineering. Canada: The Canadian Society for Civil Engineering, 1991.

MLA (9th ed.) Citation

Humar, J. L., and E. W. Wright. Directory of Commercial Computer Software for Civil Engineering. The Canadian Society for Civil Engineering, 1991.