APA (7th ed.) Citation

Barrett-Lennard, G. T. (1998). Carl Rogers' helping system: Journey and substance. Sage.

Chicago Style (17th ed.) Citation

Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. London [etc.]: Sage, 1998.

MLA (9th ed.) Citation

Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Sage, 1998.

Warning: These citations may not always be 100% accurate.