1. Kraljic
P. (1983). Purchasing Must Become Supply Management. Harvard Business Review
61(5)
pp. 109-117. (The seminal article describes strategies for the strategic quadrant focusing on long-term availability
including long-term contracts and vertical integration).
2. CIPS (Chartered Institute of Procurement & Supply). (2018). Managing Supply Chain Risk (L5M2). CIPS Official Course Book. Profex Publishing
pp. 55-59. (The official CIPS text outlines strategies for the strategic quadrant
emphasizing the need for collaboration
long-term relationships
and securing supply
for which forward contracts are a key tool).
3. Van Weele
A. J. (2018). Purchasing and Supply Chain Management. 7th Edition. Cengage Learning. Chapter 5
Section 5.4
"The Purchasing Portfolio Matrix." (This academic text details the Kraljic matrix and explicitly links strategies like long-term contracts and forward buying to the strategic quadrant to ensure supply security).