Cita APA (7a ed.)

Freud, S., & Tyson, A. (1957). Leonardo da Vinci: A memory of his childhood (2nd ed.). Routledge.

Cita Chicago Style (17a ed.)

Freud, Sigmund, y Alan Tyson. Leonardo Da Vinci: A Memory of His Childhood. 2nd ed. Oxfordshire, England ; New York: Routledge, 1957.

Cita MLA (9a ed.)

Freud, Sigmund, y Alan Tyson. Leonardo Da Vinci: A Memory of His Childhood. 2nd ed. Routledge, 1957.