Cita APA (7a ed.)

Haeckel, E. (1906). The evolution of man. A popular scientific study. Watts & Co.

Cita Chicago Style (17a ed.)

Haeckel, Ernst. The Evolution of Man. A Popular Scientific Study. Londres: Watts & Co, 1906.

Cita MLA (9a ed.)

Haeckel, Ernst. The Evolution of Man. A Popular Scientific Study. Watts & Co, 1906.