Dyfyniad APA
Willis, J. F., & Primack, M. L. (1977). Explorations in economics. Houghton Mifflin.
Dyfyniad Arddull Chicago
Willis, James Frederick, and Martin L. Primack. Explorations in Economics. Boston: Houghton Mifflin, 1977.
Dyfyniad MLA
Willis, James Frederick, and Martin L. Primack. Explorations in Economics. Houghton Mifflin, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.