Cita APA (7th ed.)

Hugh F. Lena:William B. & McCord Helmreich. (1992). Contemporary Issues in Society. Mc Graw Hill.

Cita Chicago (17th ed.)

Hugh F. Lena:William B. i McCord Helmreich. Contemporary Issues in Society. America: Mc Graw Hill, 1992.

Cita MLA (9th ed.)

Hugh F. Lena:William B. i McCord Helmreich. Contemporary Issues in Society. Mc Graw Hill, 1992.