Cita APA (7a ed.)

Cerny, J. (1929). A note on the repeating of births. [s.n.].

Cita Chicago Style (17a ed.)

Cerny, Jaroslav. A Note on the Repeating of Births. [S.l.]: [s.n.], 1929.

Cita MLA (9a ed.)

Cerny, Jaroslav. A Note on the Repeating of Births. [s.n.], 1929.