Dyfyniad APA

The Practice of Social Research. Wadsworth Cengage Learning.

Dyfyniad Arddull Chicago

The Practice of Social Research. Wadsworth Cengage Learning.

Dyfyniad MLA

The Practice of Social Research. Wadsworth Cengage Learning.

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