Gaya APA
Steffen, P.
(2017).
Bentonite Handbook Lubrication for Pipe Jackin
.
Germany:
Ernst & Sohn.
Gaya MLA
Steffen, Praetorius.
"Bentonite Handbook Lubrication for Pipe Jackin".
Germany:
Ernst & Sohn,
2017.
Text.