Gaya APA

Thuesen, G, J., Fabrycky, W, J. (2001). Engineering economy. Ninth Edition (2001). : New Jersey : Prentice-Hall Inc.,.

Gaya MLA

Thuesen, Gerald, J., Fabrycky, W, J. "Engineering economy. Ninth Edition". 2001 : New Jersey : Prentice-Hall Inc.,, 2001. Text.