Lester, H., & Munsinger, L. (1988). Tacky the penguin. Houghton Mifflin Co..
Lua i Stíl Chicago (17ú heag.)Lester, Helen, agus Lynn Munsinger. Tacky the Penguin. Boston: Houghton Mifflin Co., 1988.
Lua MLA (8ú heag.)Lester, Helen, agus Lynn Munsinger. Tacky the Penguin. Houghton Mifflin Co., 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.