Gaya APA

lev, N., jim, B. (2005). progressing cavity pumps downhole pumps and mudmotors . Houston,Texas: Houston-Texas : Gulf Publishing Company,.

Gaya MLA

lev, Nelik., jim, Brennan. "progressing cavity pumps downhole pumps and mudmotors". Houston,Texas: Houston-Texas : Gulf Publishing Company,, 2005. Text.