Cita APA (7a ed.)

Wellens, S. J. Houghton Mifflin English grammar and composition. Houghton Mifflin Company.

Cita Chicago Style (17a ed.)

Wellens, Sandra J. Houghton Mifflin English Grammar and Composition. Houghton Mifflin Company.

Cita MLA (8a ed.)

Wellens, Sandra J. Houghton Mifflin English Grammar and Composition. Houghton Mifflin Company.

Precaución: Estas citas no son 100% exactas.