Cita APA (7a ed.)

Gordon, I. A. (1980). Practical punctuation. Heinemann Educactional Books.

Cita Chicago Style (17a ed.)

Gordon, Ian A. Practical Punctuation. London: Heinemann Educactional Books, 1980.

Cita MLA (9a ed.)

Gordon, Ian A. Practical Punctuation. Heinemann Educactional Books, 1980.