Ellgen, P. (2015). Psoas strength and flexibility: Core workouts to increase mobility, reduce injuries and end back pain. Ulysses Press.
Chicago Style (17th ed.) CitationEllgen, Pamela. Psoas Strength and Flexibility: Core Workouts to Increase Mobility, Reduce Injuries and End Back Pain. Berklely, CA: Ulysses Press, 2015.
MLA (8th ed.) CitationEllgen, Pamela. Psoas Strength and Flexibility: Core Workouts to Increase Mobility, Reduce Injuries and End Back Pain. Ulysses Press, 2015.
Warning: These citations may not always be 100% accurate.