Cita APA (7a ed.)

Williamson, C. N., & Williamson, A. M. (1910). Love and the spy. Thomas Nelson and Sons.

Cita Chicago Style (17a ed.)

Williamson, Charles Norris, y Alice Muriel Williamson. Love and the Spy. London [etc.]: Thomas Nelson and Sons, 1910.

Cita MLA (9a ed.)

Williamson, Charles Norris, y Alice Muriel Williamson. Love and the Spy. Thomas Nelson and Sons, 1910.