Gaya APA
Cothern, C., Rebers, P, A. (1991).
Radon, radium and uranium in drinking water .
America:
Lewis Publishers, Inc.
Gaya MLA
Cothern, C.Richard., Rebers, Paul, A..
"Radon, radium and uranium in drinking water".
America:
Lewis Publishers, Inc,
1991.
Text.