Lua APA (7ú heag.)
Texas Education Agency & Texas Education Agency. (1978). Preferred signs: For instructional purposes. Texas Education Agency..
Lua i Stíl Chicago (17ú heag.)
Texas Education Agency agus Texas Education Agency. Preferred Signs: For Instructional Purposes. Texas, U.S.A.: Texas Education Agency., 1978.
Lua MLA (9ú heag.)
Texas Education Agency agus Texas Education Agency. Preferred Signs: For Instructional Purposes. Texas Education Agency., 1978.
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