Cita APA (7a ed.)
National Research Bureau (Chicago, Ill.). Supervision. National Research Bureau.
Cita Chicago Style (17a ed.)
National Research Bureau (Chicago, Ill.). Supervision. Burlington, IA: National Research Bureau.
Cita MLA (9a ed.)
National Research Bureau (Chicago, Ill.). Supervision. National Research Bureau.
Precaución: Estas citas no son 100% exactas.