Gastwirth, P., & Plover, C. L. (1967). Building language power series (Teacher's ed.). Charles E. Merrill Pub. Co..
Lua i Stíl Chicago (17ú heag.)Gastwirth, Paul, agus Catherine L. Plover. Building Language Power Series. Teacher's ed. Columbus, Oh.: Charles E. Merrill Pub. Co., 1967.
Lua MLA (8ú heag.)Gastwirth, Paul, agus Catherine L. Plover. Building Language Power Series. Teacher's ed. Charles E. Merrill Pub. Co., 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.