Hirsh, S. P. (1971). The Courage to change: New directions for career education. Englewood Cliffs.
Lua i Stíl Chicago (17ú heag.)Hirsh, Sharlene Pearlman. The Courage to Change: New Directions for Career Education. Englewood Cliffs, N. J: Englewood Cliffs, 1971.
Lua MLA (9ú heag.)Hirsh, Sharlene Pearlman. The Courage to Change: New Directions for Career Education. Englewood Cliffs, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.