(1982). Isometric exercise and its clinical implications / by Jerrold Scott Petrofsky.
Chicago-viite (17. p.)Isometric Exercise and Its Clinical Implications / by Jerrold Scott Petrofsky. 1982.
MLA-viite (9. p.)Isometric Exercise and Its Clinical Implications / by Jerrold Scott Petrofsky. 1982.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.