Citazione Stile APA (7a Edizione)

Powderly, L. E. (1951). A world tour: A curriculum resource guide for teachers ; (tenth grade common learnings). Public Schools.

Citazione stile Chigago Style (17a edizione)

Powderly, Leonard E. A World Tour: A Curriculum Resource Guide for Teachers ; (tenth Grade Common Learnings). St. Paul, Minnesota: Public Schools, 1951.

Citatione MLA (9a ed.)

Powderly, Leonard E. A World Tour: A Curriculum Resource Guide for Teachers ; (tenth Grade Common Learnings). Public Schools, 1951.