APA
Houghton Mifflin Company,, . (2004). Houghton Mifflin English. Boston: Houghton Mifflin.
Chicago
Houghton Mifflin Company,, . 2004. Houghton Mifflin English. Boston: Houghton Mifflin.
Harvard
Houghton Mifflin Company,, . (2004). Houghton Mifflin English. Boston: Houghton Mifflin.
MLA
Houghton Mifflin Company,, . Houghton Mifflin English. Boston: Houghton Mifflin. 2004.