Cita APA (7a ed.)

Heron, J. (1990). Helping the client: A creative practical guide. Sage.

Cita Chicago Style (17a ed.)

Heron, John. Helping the Client: A Creative Practical Guide. London [etc.]: Sage, 1990.

Cita MLA (9a ed.)

Heron, John. Helping the Client: A Creative Practical Guide. Sage, 1990.