APA (7th ed.) Citation

Siwek, P. (1930). De instinctus natura. Marietti.

Chicago Style (17th ed.) Citation

Siwek, Paul. De Instinctus Natura. Torino: Marietti, 1930.

MLA (9th ed.) Citation

Siwek, Paul. De Instinctus Natura. Marietti, 1930.

Warning: These citations may not always be 100% accurate.