APA-čujuhus (7. p.)
Willis, F. R. (1973). World civilizations: An urban perspective. D.C. Heath.
Chicago-čujuhus (17. p.)
Willis, F. Roy. World Civilizations: An Urban Perspective. Massachusetts: D.C. Heath, 1973.
MLA-čujuhus (9. p.)
Willis, F. Roy. World Civilizations: An Urban Perspective. D.C. Heath, 1973.
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