Kaplan test prep and admissions: GRE course book. s.n.].
Chicago Style aipamenaKaplan Test Prep and Admissions: GRE Course Book. [S.l: s.n.].
MLA aipamenaKaplan Test Prep and Admissions: GRE Course Book. s.n.].
Kontuz: berrikusi erreferentzia hauek erabili aurretik.