Trimble, S. (2003). Keeping fit in your 50s: Workout essentials for a changing body. Acorn Media.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTrimble, Skye. Keeping Fit in Your 50s: Workout Essentials for a Changing Body. Silver Spring, MD: Acorn Media, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTrimble, Skye. Keeping Fit in Your 50s: Workout Essentials for a Changing Body. Acorn Media, 2003.
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