1.		Is constrained leisure an internally homogeneous concept? / Edgar L. Jackson, Elaine Dunn Autor: Jackson, Edgar L. Coautor: ; Dunn, Elaine
2.		A hierarchical model of leisure constraints / Duane W. Crawford, Edgar L. Jackson, Geoffrey Godbey Autor: Crawford, Duane W. Coautor: ; Jackson, Edgar L. Resp- Sec.: Godbey, Geoffrey
3.		Individual and institutional concentration of leisure research in North América / Edgar L. Jackson Autor: Jackson, Edgar L.