Cita APA (7a ed.)

Kekulé, R. (1896). Ernst Curtius. W. Spemann.

Cita Chicago Style (17a ed.)

Kekulé, Reinhard. Ernst Curtius. Berlin: W. Spemann, 1896.

Cita MLA (8a ed.)

Kekulé, Reinhard. Ernst Curtius. W. Spemann, 1896.