Syed Abdul Rehman Khan and Zhang Yu (March 25th 2019). Introductory Chapter: Purchasing and Supply Management [Online First], IntechOpen, DOI: 10.5772/intechopen.85380. Available from:

About the Author Abdul Karim Zakir mansaray

A Sierraleonean by nationality. black in 5ft 11inch tall having degree in business administration and advanced certificate in information technology...also having a certificate in entrepreneurship and innovation. Studying currently Java and html