Haeckel, E. (1905). Three lectures on evolution. Haldeman-Julius.
Cita Chicago Style (17a ed.)Haeckel, Ernst. Three Lectures on Evolution. Girard, Kansas: Haldeman-Julius, 1905.
Cita MLA (8a ed.)Haeckel, Ernst. Three Lectures on Evolution. Haldeman-Julius, 1905.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.