Cita APA (7th ed.)

Gordon, I. A. (1978). Practical punctuation. Heinemann Educational Books.

Cita Chicago (17th ed.)

Gordon, Ian A. Practical Punctuation. Londres: Heinemann Educational Books, 1978.

Cita MLA (9th ed.)

Gordon, Ian A. Practical Punctuation. Heinemann Educational Books, 1978.