APA (7th ed.) Citation

Wallace, I. (1986). El séptimo secreto. Planeta.

Chicago Style (17th ed.) Citation

Wallace, Irving. El Séptimo Secreto. España: Planeta, 1986.

MLA (9th ed.) Citation

Wallace, Irving. El Séptimo Secreto. Planeta, 1986.

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