Haddan, E. E. (1970). Evolving instruction. Macmillan.
Lua i Stíl Chicago (17ú heag.)Haddan, Eugene E. Evolving Instruction. [New York]: Macmillan, 1970.
Lua MLA (9ú heag.)Haddan, Eugene E. Evolving Instruction. Macmillan, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.