IMS/VS version 1 :
system programming reference manual.

APA Citation

International Business Machines Corporation. (1980). IMS/VS version 1: system programming reference manual. 9th ed. San Jose, California: IBM Corporation.

MLA Citation

International Business Machines Corporation. IMS/VS Version 1: System Programming Reference Manual. 9th ed. San Jose, California: IBM Corporation, 1980.

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