Vlasak, J. C. (1952). A statistical study of one hundred cases known to the Shell Guidance Service, Social Service Department, Catholic Youth Organization, Chicago, Illinois, and closed during the period, July, 1949 to January, 1952.
Lua i Stíl Chicago (17ú heag.)Vlasak, Joseph Charles. A Statistical Study of One Hundred Cases Known to the Shell Guidance Service, Social Service Department, Catholic Youth Organization, Chicago, Illinois, and Closed During the Period, July, 1949 to January, 1952. 1952.
Lua MLA (8ú heag.)Vlasak, Joseph Charles. A Statistical Study of One Hundred Cases Known to the Shell Guidance Service, Social Service Department, Catholic Youth Organization, Chicago, Illinois, and Closed During the Period, July, 1949 to January, 1952. 1952.
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