Παραπομπή APA

Longley- Cook L H. (1970). Statistical problems and how to solve them. Barnes and Noble.

Παραπομπή Chicago Style

Longley- Cook L H. Statistical Problems and How to Solve Them. NewYork: Barnes and Noble, 1970.

Παραπομπή MLA

Longley- Cook L H. Statistical Problems and How to Solve Them. Barnes and Noble, 1970.