Cita APA (7th ed.)

Zion, G., & Graham, M. B. (2006). Harry, the dirty dog (1st. board book ed.; 50th anniversary ed.). HarperFestival.

Cita Chicago (17th ed.)

Zion, Gene, i Margaret Bloy Graham. Harry, the Dirty Dog. 1st. board book ed.; 50th anniversary ed. [New York]: HarperFestival, 2006.

Cita MLA (8th ed.)

Zion, Gene, i Margaret Bloy Graham. Harry, the Dirty Dog. 1st. board book ed.; 50th anniversary ed. HarperFestival, 2006.