Dyfyniad APA

Catallaxy | Institute of Economic Research. Cambridge University Press.

Dyfyniad Arddull Chicago

Catallaxy | Institute of Economic Research. Cambridge University Press.

Dyfyniad MLA

Catallaxy | Institute of Economic Research. Cambridge University Press.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.