Pettigrew, S., Jongenelis, M., Newton, R. U., Warburton, J., & Jackson, B. (2015). Research protocol for a randomized controlled trial of the health effects of volunteering for seniors. Health Qual Life Outcomes.

Pettigrew, Simone, Michelle Jongenelis, Robert U. Newton, Jeni Warburton, and Ben Jackson. "Research Protocol for a Randomized Controlled Trial of the Health Effects of Volunteering for Seniors." Health Qual Life Outcomes 2015.

Pettigrew, Simone, et al. "Research Protocol for a Randomized Controlled Trial of the Health Effects of Volunteering for Seniors." Health Qual Life Outcomes 2015.