APA (7th ed.) Citation

Lercaro, G., De Rosa, G. d., & John XXIII, P. (1967). John XXIII; simpleton or saint? Franciscan Herald Press.

Chicago Style (17th ed.) Citation

Lercaro, Giacomo, Gabriele de De Rosa, and Pope John XXIII. John XXIII; Simpleton or Saint? Chicago: Franciscan Herald Press, 1967.

MLA (9th ed.) Citation

Lercaro, Giacomo, et al. John XXIII; Simpleton or Saint? Franciscan Herald Press, 1967.