Cita APA

Pingel, F. (1999). UNESCO guidebook: On textbook research and textbook revision. Hahn.

Citación estilo Chicago

Pingel, Falk. UNESCO Guidebook: On Textbook Research and Textbook Revision. Hannover: Hahn, 1999.

Cita MLA

Pingel, Falk. UNESCO Guidebook: On Textbook Research and Textbook Revision. Hahn, 1999.