Autonomous Region in Muslim Mindanao, Department of Agriculture: Lanao del SurDiarsipkan 2015-01-19 di Wayback Machine. (There are major discrepancies among authoritative sources: 4121.3 km² (NAMRIA); 1,349,437 ha (NSCB, this value seems unreasonable and must be assumed as erroneous, see Pembicaraan:Lanao del Sur#Area))
nscb.gov.ph
National Statistical Coordination Board (2006-04-27). "2006 Factsheet". Diarsipkan dari versi asli tanggal 2007-09-30. Diakses tanggal 2006-06-24.
web.archive.org
Autonomous Region in Muslim Mindanao, Department of Agriculture: Lanao del SurDiarsipkan 2015-01-19 di Wayback Machine. (There are major discrepancies among authoritative sources: 4121.3 km² (NAMRIA); 1,349,437 ha (NSCB, this value seems unreasonable and must be assumed as erroneous, see Pembicaraan:Lanao del Sur#Area))