EDWARD, J. (1992). Paradox 4 Made Easy. McGraw-Hill.
Chicago Style aipamenaEDWARD, JONES. Paradox 4 Made Easy. McGraw-Hill, 1992.
MLA aipamenaEDWARD, JONES. Paradox 4 Made Easy. McGraw-Hill, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.