ProQuest
Use the subject term "distribution channels" and combine with other keywords such as name of company, product or industry.

Thomson ONE Banker
Look at the Form 10-K Report of a company and using the Edit....Find tool locate where "distribution channels" appears in the report. Should you get no hits, try "distrib".

Ebscohost Business Source Elite
Use the subject term "marketing channels" and combine with other keywords such as name of company, product or industry.