Cita APA (7a ed.)
Language Network: Grammar, Writing, Communication. McDougal Littel.
Cita estilo Chicago (17a ed.)
Language Network: Grammar, Writing, Communication. Evanston, EUA: McDougal Littel.
Cita MLA (9a ed.)
Language Network: Grammar, Writing, Communication. McDougal Littel.
Precaución: Estas citas no son 100% exactas.