Cita APA (7a ed.)

Guzmán, M. L., & De Onís, H. (1969). The eagle and the serpent. P. Smith.

Cita Chicago Style (17a ed.)

Guzmán, Martín Luis, y Harriet De Onís. The Eagle and the Serpent. Gloucester, Mass: P. Smith, 1969.

Cita MLA (9a ed.)

Guzmán, Martín Luis, y Harriet De Onís. The Eagle and the Serpent. P. Smith, 1969.