CLELAND, D. I., & KING, W. R. (1987). Systems analysis and project management.-- Ed.3. McGraw-Hill Boook.

CLELAND, David I., and William R. KING. Systems Analysis and Project Management.-- Ed.3. Auckland: McGraw-Hill Boook, 1987.

CLELAND, David I., and William R. KING. Systems Analysis and Project Management.-- Ed.3. McGraw-Hill Boook, 1987.