Leveson, I. (1968). The effects of improved health on productivity through education. Rand Corp..
Citazione stile Chigago Style (17a edizione)Leveson, Irving. The Effects of Improved Health on Productivity Through Education. Santa Monica, Calif.: Rand Corp., 1968.
Citatione MLA (8a ed.)Leveson, Irving. The Effects of Improved Health on Productivity Through Education. Rand Corp., 1968.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.