Alusik, J. (1973). Illustrated handbook of general science teaching aids. Parker Pub. Co.
Lua i Stíl Chicago (17ú heag.)Alusik, John. Illustrated Handbook of General Science Teaching Aids. West Nyack, N.Y: Parker Pub. Co, 1973.
Lua MLA (9ú heag.)Alusik, John. Illustrated Handbook of General Science Teaching Aids. Parker Pub. Co, 1973.
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