Não informado. Oil and Gas Investigations. State Geological Survey.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Oil and Gas Investigations. Lawrence, Kan: State Geological Survey.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Oil and Gas Investigations. State Geological Survey.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.