Amling, F. (1973). Principles of investments. Learning System Company.
Citazione stile Chigago Style (17a edizione)Amling, Frederick. Principles of Investments. Illinois: Learning System Company, 1973.
Citatione MLA (9a ed.)Amling, Frederick. Principles of Investments. Learning System Company, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.