APA 6th Edition Style Guide: Editions

Books

Place edition information after the title. End the title with a comma, space and enclose the edition statement in parentheses.

Express numbers representing editions in Arabic ordinals, as first becomes 1st, IV becomes 4th. 

Abbreviate the word edition and other descriptive words:

• Revised edition becomes Rev. ed.
• Eighth Edition becomes 8th ed.
• Third edition becomes 3rd ed.

End with a period.

Example:

Schott, J. & Priest, J. (2002). Leading antenatal classes: A practical guide (2nd ed.). Boston, MA: Books for Midwives.