Research methods for the behavioral sciences

 Gravetter, Frederick J.; Forzano, Lori; Ann B.;

USA : Wadsworth Cengage Learning , 2015

Pengantar statistika sosial = statistics for the behavioral sciences

 Gravetter, Frederick J.; Bawono, Icuk Rangga; Wallnau, Larry B.; Purnama, M. Yusuf Indra;

Jakarta : Salemba Humanika , 2014