Pedersen, E. (1968). House upon a rock. Ahteneum Publishers.
Cita Chicago (17th ed.)Pedersen, Elsa. House upon a Rock. New York: Ahteneum Publishers, 1968.
Cita MLA (9th ed.)Pedersen, Elsa. House upon a Rock. Ahteneum Publishers, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.