Dyson, R. F. (1931). Natural prosperity. Ruskin Press.
Cita Chicago (17th ed.)Dyson, R. F. Natural Prosperity. Melbourne: Ruskin Press, 1931.
Cita MLA (8th ed.)Dyson, R. F. Natural Prosperity. Ruskin Press, 1931.
Atenció: Aquestes cites poden no estar 100% correctes.