Não informado. (1986). SPE Drilling Engineering. Society of Petroleum Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. SPE Drilling Engineering. Richardson, Tex: Society of Petroleum Engineers, 1986.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. SPE Drilling Engineering. Society of Petroleum Engineers, 1986.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.