Freund, J., Williams, F., Perles, B. Elementary Business Statistics. New Jersey: Prentice-Hall International, 1988 738 p. il. 0-13-253170-4.
Freund, J., Williams, F., Perles, B. Elementary Business Statistics. New Jersey: Prentice-Hall International, 1988 738 p. il. 0-13-253170-4.
Freund, J., Williams, F., Perles, B. (1988) Elementary Business Statistics, New Jersey: Prentice-Hall International 738 p. il. 0-13-253170-4.
Freund, J., Williams, F., & Perles, B. (1988). Elementary Business Statistics. The Modern Approach. New Jersey: Prentice-Hall International, 738 p. il.
Freund J, Williams F, Perles B. Elementary Business Statistics: The Modern Approach. New Jersey: Prentice-Hall International; 1988. p. 738 p. il. ISBN: 0-13-253170-4.