Cita APA (7th ed.)

(2006). ESRI map book, v.21. ESRI.

Cita Chicago (17th ed.)

ESRI Map Book, V.21. U.S.A: ESRI, 2006.

Cita MLA (9th ed.)

ESRI Map Book, V.21. ESRI, 2006.

Atenció: Aquestes cites poden no estar 100% correctes.