Não informado. (1972). Offshore services and technology. Spearhead Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Offshore Services and Technology. Surrey, Inglaterra: Spearhead Publications, 1972.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Offshore Services and Technology. Spearhead Publications, 1972.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.