APA (7th ed.) Citation

Hecker, I. T. (1855). Questions of the soul (6th ed.). Catholic Publication House.

Chicago Style (17th ed.) Citation

Hecker, Isaac Thomas. Questions of the Soul. 6th ed. New York: Catholic Publication House, 1855.

MLA (8th ed.) Citation

Hecker, Isaac Thomas. Questions of the Soul. 6th ed. Catholic Publication House, 1855.

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