Gaya APA

Freund, J, E., Williams, F, J. (1982). Elementary Business Statistics: The Modern Approach (Ed. 4). America: Prentce-Hall, Inc.

Gaya MLA

Freund, John, E., Williams, Frank, Jefferson. "Elementary Business Statistics: The Modern Approach". Ed. 4 America: Prentce-Hall, Inc, 1982. Text.