Cleaf, D. W. V. (1991). Action in elementary social studies. Englewood Cliffs, New Jersey: Prentice-Hall.
Chicago Style CitationCleaf, David W. Van. Action in Elementary Social Studies. Englewood Cliffs, New Jersey: Prentice-Hall, 1991.
Cita MLACleaf, David W. Van. Action in Elementary Social Studies. Englewood Cliffs, New Jersey: Prentice-Hall, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.