APA (7th ed.) Citation

Krebs Wilckens, R. (1951). Historia universal (5ª ed.). Zig-Zag.

Chicago Style (17th ed.) Citation

Krebs Wilckens, Ricardo. Historia Universal. 5ª ed. Zig-Zag, 1951.

MLA (9th ed.) Citation

Krebs Wilckens, Ricardo. Historia Universal. 5ª ed. Zig-Zag, 1951.

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