Heckman, G., & Grant Heckman; David Ingre. (2008). Thomson Engineering guide to web research 2007-2008. Toronto, Ont: Thomson Engineering.
Chicago Style aipamenaHeckman, Grant, và Grant Heckman; David Ingre. Thomson Engineering Guide to Web Research 2007-2008. Toronto, Ont: Thomson Engineering, 2008.
MLA aipamenaHeckman, Grant, và Grant Heckman; David Ingre. Thomson Engineering Guide to Web Research 2007-2008. Toronto, Ont: Thomson Engineering, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.