Gaya APA

FREIVALDS, A., NIEBEL, B, W. (2003). Niebel's methods, standards, and work design (12th ed.). Boston: McGraw-Hill.

Gaya MLA

FREIVALDS, Andris., NIEBEL, Benjamin, W.. "Niebel's methods, standards, and work design". 12th ed. Boston: McGraw-Hill, 2003. Buku.