Alexander, G. G. U. a. W. M. Innovations in Secondary Education. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Alexander, Glenys G. Unruh and William M. Innovations in Secondary Education. Holt, Rinehart and Winston.
Lua MLA (8ú heag.)Alexander, Glenys G. Unruh and William M. Innovations in Secondary Education. Holt, Rinehart and Winston.
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