Cita APA

Stahl, J., & Stahl, J. (1971). A Note on the recycling of natural resources. Alberta: University of Calgary Dept of Economics.

Citación estilo Chicago

Stahl, J.E., y J.E Stahl. A Note On the Recycling of Natural Resources. Alberta: University of Calgary Dept of Economics, 1971.

Cita MLA

Stahl, J.E., y J.E Stahl. A Note On the Recycling of Natural Resources. Alberta: University of Calgary Dept of Economics, 1971.