APA (7th ed.) Citation

Holmes, K., Smith, K., & Frost, W. (2011). The value of zoo volunteer programmes. Channel view publications.

Chicago Style (17th ed.) Citation

Holmes, Kirsten, K. Smith, and Warwick Frost. The Value of Zoo Volunteer Programmes. Channel view publications, 2011.

MLA (9th ed.) Citation

Holmes, Kirsten, et al. The Value of Zoo Volunteer Programmes. Channel view publications, 2011.