Cita APA (7th ed.)
Texas Education Agency & Texas Education Agency. (1978). Preferred signs: For instructional purposes. Texas Education Agency..
Cita Chicago (17th ed.)
Texas Education Agency i Texas Education Agency. Preferred Signs: For Instructional Purposes. Texas, U.S.A.: Texas Education Agency., 1978.
Cita MLA (9th ed.)
Texas Education Agency i Texas Education Agency. Preferred Signs: For Instructional Purposes. Texas Education Agency., 1978.
Atenció: Aquestes cites poden no estar 100% correctes.