APA (7th ed.) Citation

Peale, N. V., & Macein, J. (1964). El optimista tenaz. Grijalbo.

Chicago Style (17th ed.) Citation

Peale, Norman Vincent, and Jaime Macein. El Optimista Tenaz. México [etc.]: Grijalbo, 1964.

MLA (9th ed.) Citation

Peale, Norman Vincent, and Jaime Macein. El Optimista Tenaz. Grijalbo, 1964.

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