Ellgen, P. (2015). Psoas strength and flexibility: Core workouts to increase mobility, reduce injuries and end back pain. Ulysses Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEllgen, Pamela. Psoas Strength and Flexibility: Core Workouts to Increase Mobility, Reduce Injuries and End Back Pain. Berklely, CA: Ulysses Press, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEllgen, Pamela. Psoas Strength and Flexibility: Core Workouts to Increase Mobility, Reduce Injuries and End Back Pain. Ulysses Press, 2015.
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