Dyfyniad APA

John, R., & Buchan, J. (2008). The thirty-nine steps: Level 3. Harlow: Pearson Education.

Dyfyniad Arddull Chicago

John, Roland., và John Buchan. The Thirty-nine Steps: Level 3. Harlow: Pearson Education, 2008.

Dyfyniad MLA

John, Roland., và John Buchan. The Thirty-nine Steps: Level 3. Harlow: Pearson Education, 2008.

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