APA-referens (7:e uppl.)

Skarstrom, W. (1921). Gymnastic teaching ([2d. ed.].). American physical education association.

Chicago-referens (17:e uppl.)

Skarstrom, William. Gymnastic Teaching. [2d. ed.]. Springfield, Mass.: American physical education association, 1921.

MLA-referens (8:e uppl.)

Skarstrom, William. Gymnastic Teaching. [2d. ed.]. American physical education association, 1921.