APA-viite (7. p.)

Petry, R. C. (1941). Francis of Assisi: Apostle of poverty. Duke University Press.

Chicago-viite (17. p.)

Petry, Ray C. Francis of Assisi: Apostle of Poverty. Durham, N. C.: Duke University Press, 1941.

MLA-viite (8. p.)

Petry, Ray C. Francis of Assisi: Apostle of Poverty. Duke University Press, 1941.