Gaya APA

Ehrlich, P, R., Ehrlich, A, H. (2004). Nation of nations : a narrative history of the American republic . Washington DC: Island Press.

Gaya MLA

Ehrlich, Paul, R.., Ehrlich, Anne, H. "Nation of nations : a narrative history of the American republic". Washington DC: Island Press, 2004. Buku Tercetak.