Leech, C. (2004). Improving Competitive Advantage. Amsterdam: Elsevier Limited.
Chicago Style aipamenaLeech, Corinne. Improving Competitive Advantage. Amsterdam: Elsevier Limited, 2004.
MLA aipamenaLeech, Corinne. Improving Competitive Advantage. Amsterdam: Elsevier Limited, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.