Wasserman, P., & Scullard, A. (1994). Counting on People: Elementary Population and Environmental Activities.
Citazione stile Chigago Style (17a edizione)Wasserman, Pamela, e Anne Scullard. Counting on People: Elementary Population and Environmental Activities. 1994.
Citatione MLA (9a ed.)Wasserman, Pamela, e Anne Scullard. Counting on People: Elementary Population and Environmental Activities. 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.