Não informado. Pipeline underground utilities construction. Oildom Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Pipeline Underground Utilities Construction. Houston, Tex: Oildom Publishing.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Pipeline Underground Utilities Construction. Oildom Publishing.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.