Παραπομπή σε μορφή APA (7η εκδ.)
Hall Frederick C. (2001). Ground-Based Photographic Monitoring. United States. Department of Agriculture. Forest Service. Pacific Northwest Research Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)
Hall Frederick C. Ground-Based Photographic Monitoring. United States. Department of Agriculture. Forest Service. Pacific Northwest Research Station, 2001.
Παραπομπή σε μορφή MLA (9th εκδ.)
Hall Frederick C. Ground-Based Photographic Monitoring. United States. Department of Agriculture. Forest Service. Pacific Northwest Research Station, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.