COLLIER'S ENCYCLOPEDIA, HALSEY, W. D. [., & JOHNSTON, B. [. (1989). Collier's encyclopedia vol.18. Macmillan Educational.
Chicago-čujuhus (17. p.)COLLIER'S ENCYCLOPEDIA, William D. [edt.] HALSEY, juo Bernard [edt.] JOHNSTON. Collier's Encyclopedia Vol.18. New York: Macmillan Educational, 1989.
MLA-čujuhus (9. p.)COLLIER'S ENCYCLOPEDIA, et al. Collier's Encyclopedia Vol.18. Macmillan Educational, 1989.
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