Barrat, C. (2004). Buying for business: Insights in purchasing and supply management. John Wiley.
Chicago-viite (17. p.)Barrat, Christopher. Buying for Business: Insights in Purchasing and Supply Management. Chichester: John Wiley, 2004.
MLA-viite (8. p.)Barrat, Christopher. Buying for Business: Insights in Purchasing and Supply Management. John Wiley, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.