NWWA Conference, Association of Ground Water Scientists and Engineers (U.S.), United States Environmental Protection Agency, & Graves, B. J. (1987). Radon, radium, and other radioactivity in ground water: Hydrogeologic impact and application to indoor airborne contamination : proceedings of the NWWA Conference, April 7-9, 1987, Somerset, New Jersey. Lewis; National Water Well Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)NWWA Conference, Association of Ground Water Scientists and Engineers (U.S.), United States Environmental Protection Agency, και Barbara J. Graves. Radon, Radium, and Other Radioactivity in Ground Water: Hydrogeologic Impact and Application to Indoor Airborne Contamination : Proceedings of the NWWA Conference, April 7-9, 1987, Somerset, New Jersey. Chelsea, Mich.: Lewis; National Water Well Association, 1987.
Παραπομπή σε μορφή MLA (9th εκδ.)NWWA Conference, et al. Radon, Radium, and Other Radioactivity in Ground Water: Hydrogeologic Impact and Application to Indoor Airborne Contamination : Proceedings of the NWWA Conference, April 7-9, 1987, Somerset, New Jersey. Lewis; National Water Well Association, 1987.