Dyfyniad APA
Knapp, B. J., & McCrae, D. (1989). Challenge of the economic environment. Longman.
Dyfyniad Arddull Chicago
Knapp, Brian J., and DLR McCrae. Challenge of the Economic Environment. Harlow: Longman, 1989.
Dyfyniad MLA
Knapp, Brian J., and DLR McCrae. Challenge of the Economic Environment. Longman, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.