Certo, S. C. (1995). Human relations today: Concepts and skills. Irwin.
Citazione stile Chigago Style (17a edizione)Certo, Samuel C. Human Relations Today: Concepts and Skills. Chicago: Irwin, 1995.
Citatione MLA (9a ed.)Certo, Samuel C. Human Relations Today: Concepts and Skills. Irwin, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.