Cita APA (7th ed.)

National Productivity Corporation. (2001). A glossary of productivity and quality terminologies. National Productivity Corporation.

Cita Chicago (17th ed.)

National Productivity Corporation. A Glossary of Productivity and Quality Terminologies. Petaling Jaya: National Productivity Corporation, 2001.

Cita MLA (8th ed.)

National Productivity Corporation. A Glossary of Productivity and Quality Terminologies. National Productivity Corporation, 2001.