Bryson, Lida Kate. A Comparative Study of the Old Physical Training and Modern Physical Education to Determine the Status of Physical Activity as an Integral Part of the Modern Education Program, thesis, August 1937; (https://digital.library.unt.edu/ark:/67531/metadc29862/m1/1/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .