Trefil, J. S. (2000). The sciences: An integrated approach (2nd ed.). New York: John Wiley and Sons.
Παραπομπή Chicago StyleTrefil, James S. The Sciences: An Integrated Approach. 2nd ed. New York: John Wiley and Sons, 2000.
Παραπομπή MLATrefil, James S. The Sciences: An Integrated Approach. 2nd ed. New York: John Wiley and Sons, 2000.
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