APA (7th ed.) Citation

North, R. (1969). Prophets for the 21st century. Gregorian.

Chicago Style (17th ed.) Citation

North, Robert. Prophets for the 21st Century. Rome: Gregorian, 1969.

MLA (9th ed.) Citation

North, Robert. Prophets for the 21st Century. Gregorian, 1969.

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