(2018). GRE prep plus 2019. Kaplan Publishing.
Chicago Style aipamenaGRE Prep Plus 2019. New York: Kaplan Publishing, 2018.
MLA aipamenaGRE Prep Plus 2019. Kaplan Publishing, 2018.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
(2018). GRE prep plus 2019. Kaplan Publishing.
Chicago Style aipamenaGRE Prep Plus 2019. New York: Kaplan Publishing, 2018.
MLA aipamenaGRE Prep Plus 2019. Kaplan Publishing, 2018.