APA stil citiranja
Bullock, A. (1990). Great lives of the twentieth century: Great lives of the twentieth century. [S.l.: s.n.
Chicago stil citiranjaBullock, Alan. Great lives of the twentieth century: Great lives of the twentieth century. [S.l.: s.n, 1990.
MLA stil citiranjaBullock, Alan. Great lives of the twentieth century: Great lives of the twentieth century. [S.l.: s.n, 1990.
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