Gaya APA

BIERMAN, E, J. (1979). C.P.M. PROGRAM N.A.P.M. CERTIFICATION HANDBOOK: PREPARATION FOR EXAMINATIONS . : National Association Purchasing Management.

Gaya MLA

BIERMAN, Edward, J.. "C.P.M. PROGRAM N.A.P.M. CERTIFICATION HANDBOOK: PREPARATION FOR EXAMINATIONS". : National Association Purchasing Management, 1979. Textbook.