linsel, h., & sack, k. (1965). theoretical problems of investment planning. National Planning Institute.
Čikaški stil citiranja (17. izdanje)linsel, hermann, i kurt sack. Theoretical Problems of Investment Planning. cairo: National Planning Institute, 1965.
MLA način citiranja (9. izdanje)linsel, hermann, i kurt sack. Theoretical Problems of Investment Planning. National Planning Institute, 1965.