Gaya APA

}, G, H, R, R, A, G, T, I, P, A, E, {, E, A. et al (1995). Human Impact on the Ecosystem : conceptual frameworks in georgrafi . New York: Oliver Boyd.

Gaya MLA

}, Getting, Health, Reform, Right:, A, Guide, To, Improving, Performance, And, Equity, {, Et, Al. et al. "Human Impact on the Ecosystem : conceptual frameworks in georgrafi". New York: Oliver Boyd, 1995. Text.