APA (7th ed.) Citation

D'Ancona, U. (1954). The struggle for existence. Brill.

Chicago Style (17th ed.) Citation

D'Ancona, Umberto. The Struggle for Existence. Leiden: Brill, 1954.

MLA (9th ed.) Citation

D'Ancona, Umberto. The Struggle for Existence. Brill, 1954.

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