APA (7e ed.) Bronvermelding
Roth, J. (2008). The 20% solution: A practical guide to dramatic cost reduction in MROP procurement. Pegasus Books.
Chicago (17e ed.) Bronvermelding
Roth, Joel. The 20% Solution: A Practical Guide to Dramatic Cost Reduction in MROP Procurement. Bloomington, IN: Pegasus Books, 2008.
MLA (9e ed.) Bronvermelding
Roth, Joel. The 20% Solution: A Practical Guide to Dramatic Cost Reduction in MROP Procurement. Pegasus Books, 2008.
Let op: Deze citaties zijn niet altijd 100% accuraat.