Shartle, C. L. (1952). Occupational information, its development and application. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Shartle, Carroll Leonard. Occupational Information, Its Development and Application. Englewood Cliffs, NJ: Prentice-Hall, 1952.
Lua MLA (9ú heag.)Shartle, Carroll Leonard. Occupational Information, Its Development and Application. Prentice-Hall, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.