Stephen, P. (1997). Simple statistics for library and information professionals (2nd ed.). Library Association.
Lua i Stíl Chicago (17ú heag.)Stephen, Peter. Simple Statistics for Library and Information Professionals. 2nd ed. London: Library Association, 1997.
Lua MLA (9ú heag.)Stephen, Peter. Simple Statistics for Library and Information Professionals. 2nd ed. Library Association, 1997.
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