Dyfyniad APA
Sharp, A. M., Register, C. A., & Grimes, P. W. (1998). Economics of social issues (13th ed.). Irwin/McGraw-Hill.
Dyfyniad Arddull Chicago
Sharp, Ansel Miree, Charles A. Register, and Paul W. Grimes. Economics of Social Issues. 13th ed. Boston, Mass.: Irwin/McGraw-Hill, 1998.
Dyfyniad MLA
Sharp, Ansel Miree, et al. Economics of Social Issues. 13th ed. Irwin/McGraw-Hill, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.