Coval Joshua. Williams, 2002. Harvard Business.
Chicago Style aipamenaCoval Joshua. Williams, 2002. : Harvard Business.
MLA aipamenaCoval Joshua. Williams, 2002. Harvard Business.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Coval Joshua. Williams, 2002. Harvard Business.
Chicago Style aipamenaCoval Joshua. Williams, 2002. : Harvard Business.
MLA aipamenaCoval Joshua. Williams, 2002. Harvard Business.