Beyer, B. K. (1991). Teaching thinking skills: A handbook for secondary school teachers. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Beyer, Barry K. Teaching Thinking Skills: A Handbook for Secondary School Teachers. Boston: Allyn and Bacon, 1991.
Lua MLA (9ú heag.)Beyer, Barry K. Teaching Thinking Skills: A Handbook for Secondary School Teachers. Allyn and Bacon, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.