Cita APA (7a ed.)
Umphrey, G. W. Spanish Prose Composition. American Book Company.
Cita estilo Chicago (17a ed.)
Umphrey, George Wallace. Spanish Prose Composition. Nueva York, EUA: American Book Company.
Cita MLA (9a ed.)
Umphrey, George Wallace. Spanish Prose Composition. American Book Company.
Precaución: Estas citas no son 100% exactas.