Joseph H W B. (2009). Introduction to logic. Bharatiya Kala Prakashan.
Chicago Style aipamenaJoseph H W B. Introduction to Logic. Delhi: Bharatiya Kala Prakashan, 2009.
MLA aipamenaJoseph H W B. Introduction to Logic. Bharatiya Kala Prakashan, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.