APA Style
WILSON, E, L., HABIBULLAH, A. (1989).
SAP90 : a series of computer programs for the static and dynamic finite element analysis of structures sample example and verification manual .
California:
Computer & Structures.
MLA Style
WILSON, EDWARD, L.., HABIBULLAH, ASHRAF.
"SAP90 : a series of computer programs for the static and dynamic finite element analysis of structures sample example and verification manual".
California:
Computer & Structures,
1989.
Text.