Krakow : Wydawnicatwo instytyty Mechaniki gorotwoeru Pan, 207,
Majalah, Jurnal, Buletin
Silverstein, Alvin
Rinehart and Winston, 1974
Buku Teks
[T.t.] [t.p.] 1975
Buku Teks
edited by H.M. Blalock
Aldine Publishing, 1974
Buku Teks
Owen, Claudia
Brooks/Cole Cengage Learning, 2010
Buku Teks