khanna, r. (2015). Production and operations management (2nd ed.). phl learning private limited.
Chicago-viite (17. p.)khanna, r.b. Production and Operations Management. 2nd ed. new delhi: phl learning private limited, 2015.
MLA-viite (9. p.)khanna, r.b. Production and Operations Management. 2nd ed. phl learning private limited, 2015.