Koper, I., Pasman, H. R. W., Schweitzer, B. P. M., Kuin, A., & Onwuteaka-Philipsen, B. D. (2019). Spiritual care at the end of life in the primary care setting: Experiences from spiritual caregivers - a mixed methods study. BMC Palliat Care.

Koper, Ian, H. Roeline W. Pasman, Bart P. M. Schweitzer, Annemieke Kuin, και Bregje D. Onwuteaka-Philipsen. "Spiritual Care At the End of Life in the Primary Care Setting: Experiences From Spiritual Caregivers - a Mixed Methods Study." BMC Palliat Care 2019.

Koper, Ian, et al. "Spiritual Care At the End of Life in the Primary Care Setting: Experiences From Spiritual Caregivers - a Mixed Methods Study." BMC Palliat Care 2019.