Kristoffersen, E. S., Aaseth, K., Grande, R. B., Lundqvist, C., & Russell, M. B. (2013). Self-reported efficacy of complementary and alternative medicine: The Akershus study of chronic headache. Springer.

Kristoffersen, Espen Saxhaug, Kjersti Aaseth, Ragnhild Berling Grande, Christofer Lundqvist, و Michael Bjørn Russell. Self-reported Efficacy of Complementary and Alternative Medicine: The Akershus Study of Chronic Headache. Springer, 2013.

Kristoffersen, Espen Saxhaug, et al. Self-reported Efficacy of Complementary and Alternative Medicine: The Akershus Study of Chronic Headache. Springer, 2013.