Schuller, R. (1946). Living positively one day at a time. New York international bible society.
Citazione stile Chigago Style (17a edizione)Schuller, Robert. Living Positively One Day at a Time. New York: New York international bible society, 1946.
Citatione MLA (9a ed.)Schuller, Robert. Living Positively One Day at a Time. New York international bible society, 1946.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.