Cita APA (7th ed.)

Castle, A., & Castle, E. (1912). The grip of life. Macmillan.

Cita Chicago (17th ed.)

Castle, Agnes, i Egerton Castle. The Grip of Life. London: Macmillan, 1912.

Cita MLA (8th ed.)

Castle, Agnes, i Egerton Castle. The Grip of Life. Macmillan, 1912.