Gaya APA

Swanson, C, P., Heinz, I, K. (). Economics the science of scarcity . Hinsdale:: Hinsdale: The Dryden Press; 1970.

Gaya MLA

Swanson, Carl, P.., Heinz, I., Kohler,. "Economics the science of scarcity". Hinsdale:: Hinsdale: The Dryden Press; 1970, . Text.