Lowenthal, W. (1991). There are no secrets: Professor Cheng Man-chʻing and his tai chi chuan. North Atlantic Books.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিLowenthal, Wolfe. There Are No Secrets: Professor Cheng Man-chʻing and His Tai Chi Chuan. Berkeley, Calif.: North Atlantic Books, 1991.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিLowenthal, Wolfe. There Are No Secrets: Professor Cheng Man-chʻing and His Tai Chi Chuan. North Atlantic Books, 1991.
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