APA (7th ed.) Citation

Ashworth, J., & Clark, J. (1998). New stepping stones: Activity book (1ª ed.).

Chicago Style (17th ed.) Citation

Ashworth, Julie, and John Clark. New Stepping Stones: Activity Book. 1ª ed. Edinburgh, 1998.

MLA (9th ed.) Citation

Ashworth, Julie, and John Clark. New Stepping Stones: Activity Book. 1ª ed. 1998.