Gaya APA

Pecsok, R, L., Shields, L, D. (1968). Modern methods of chemical analysis. (1968). : New York : John Wiley & Sons, Inc.,.

Gaya MLA

Pecsok, Robert, L.., Shields, L., Donald. "Modern methods of chemical analysis.". 1968 : New York : John Wiley & Sons, Inc.,, 1968. Text.