Dyfyniad APA

Beri G C. (2013). Marketing Research (5th.). McGraw Hill.

Dyfyniad Arddull Chicago

Beri G C. Marketing Research. 5th. New Delhi: McGraw Hill, 2013.

Dyfyniad MLA

Beri G C. Marketing Research. 5th. McGraw Hill, 2013.

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