(2006). ESRI map book, v.21. ESRI.
Chicago Style aipamenaESRI Map Book, V.21. U.S.A: ESRI, 2006.
MLA aipamenaESRI Map Book, V.21. ESRI, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena
(2006). ESRI map book, v.21. ESRI.
Chicago Style aipamenaESRI Map Book, V.21. U.S.A: ESRI, 2006.
MLA aipamenaESRI Map Book, V.21. ESRI, 2006.