Flexible Pavement Design System (FPS) 19 :
user's manual.

APA Citation

Texas. Department of Transportation. Office of Research and Technology Transfer., Texas Transportation Institute. (1998). Flexible Pavement Design System (FPS) 19: user's manual. .

MLA Citation

Texas. Department of Transportation. Office of Research and Technology Transfer, and Texas Transportation Institute. Flexible Pavement Design System (FPS) 19: User's Manual. , 1998.

Warning: These citations may not always be complete (especially for serials).