Faulkner, Guy E.J., John J.M. Dwyer, Hyacinth Irving, Kenneth R. Allison, Edward M. Adlaf, and Jack Goodman. 2008. “Specialist or Nonspecialist Physical Education Teachers in Ontario Elementary Schools: Examining Differences in Opportunities for Physical Activity”. Alberta Journal of Educational Research 54 (4). https://doi.org/10.11575/ajer.v54i4.55247.