Gary G Bitter, N. R. (1985). IBM Logo Primer. Reston.
Chicago Style aipamenaGary G Bitter, Nancy Ralph.Watson. IBM Logo Primer. Reston, 1985.
MLA aipamenaGary G Bitter, Nancy Ralph.Watson. IBM Logo Primer. Reston, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.