APA-referens (7:e uppl.)

Gladden, W. (1904). Where does the sky begin? Houghton, Mifflin and company.

Chicago-referens (17:e uppl.)

Gladden, Washington. Where Does the Sky Begin? Boston and New York: Houghton, Mifflin and company, 1904.

MLA-referens (8:e uppl.)

Gladden, Washington. Where Does the Sky Begin? Houghton, Mifflin and company, 1904.