APA
Sri Lanka Institute of Development Administration, . (1987). Notes on Purchasing and Materials Management. Colombo: Sri Lanka Institute of Development Administration.
Chicago
Sri Lanka Institute of Development Administration, . 1987. Notes on Purchasing and Materials Management. Colombo: Sri Lanka Institute of Development Administration.
Harvard
Sri Lanka Institute of Development Administration, . (1987). Notes on Purchasing and Materials Management. Colombo: Sri Lanka Institute of Development Administration.
MLA
Sri Lanka Institute of Development Administration, . Notes on Purchasing and Materials Management. Colombo: Sri Lanka Institute of Development Administration. 1987.
