APA (7th ed.) Citation

Winter, A. R. (1949). Why not make a retreat? Mayfield Pamphlet Service.

Chicago Style (17th ed.) Citation

Winter, A. R. Why Not Make a Retreat? [Place of publication not identified]: Mayfield Pamphlet Service, 1949.

MLA (8th ed.) Citation

Winter, A. R. Why Not Make a Retreat? Mayfield Pamphlet Service, 1949.