Cita APA (7a ed.)

Ashworth, J., & Clark, J. (1990). Stepping stones: Contents (1. publ.). Collins.

Cita Chicago Style (17a ed.)

Ashworth, Julie, y John Clark. Stepping Stones: Contents. 1. publ. London: Collins, 1990.

Cita MLA (9a ed.)

Ashworth, Julie, y John Clark. Stepping Stones: Contents. 1. publ. Collins, 1990.