ASTM Subcommittee D18.21 on Ground Water Monitoring, American Society for Testing and Materials, Nielsen, D., & Johnson, A. I. (1990). Ground water and vadose zone monitoring. ASTM.
Chicago (17e ed.) BronvermeldingASTM Subcommittee D18.21 on Ground Water Monitoring, American Society for Testing and Materials, David Nielsen, en A. I. Johnson. Ground Water and Vadose Zone Monitoring. Philadelphia, PA: ASTM, 1990.
MLA (9e ed.) BronvermeldingASTM Subcommittee D18.21 on Ground Water Monitoring, et al. Ground Water and Vadose Zone Monitoring. ASTM, 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.