An introduction to CAD using CADKEY :
for Version 4.0 and CADKEY Light (compatible to all lower versions) /
Hugh F. Keedy.

APA Citation

Keedy, H. F. (1991). An introduction to CAD using CADKEY: for Version 4.0 and CADKEY Light (compatible to all lower versions). 2nd ed., rev. print. Boston, Mass.: PWS-KENT Pub. Co..

MLA Citation

Keedy, Hugh F. An Introduction to CAD Using CADKEY: for Version 4.0 And CADKEY Light (compatible to All Lower Versions). 2nd ed., rev. print. Boston, Mass.: PWS-KENT Pub. Co., 1991.

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