Maps.com (Firm) & ebrary, Inc. (2000). Possible migration routes of the first Americans. Maps.com.
Citazione stile Chigago Style (17a edizione)Maps.com (Firm) e Inc ebrary. Possible Migration Routes of the First Americans. [S.l.]: Maps.com, 2000.
Citatione MLA (9a ed.)Maps.com (Firm) e Inc ebrary. Possible Migration Routes of the First Americans. Maps.com, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.