Cita APA (7a ed.)
Schiller, A. Language and How to Use it: Book 5. Scott, Foresman and Company.
Cita estilo Chicago (17a ed.)
Schiller, Andrew. Language and How to Use It: Book 5. Glenview, EUA: Scott, Foresman and Company.
Cita MLA (9a ed.)
Schiller, Andrew. Language and How to Use It: Book 5. Scott, Foresman and Company.
Precaución: Estas citas no son 100% exactas.