Fifth International Williston Basin Symposium : core workshop volume
MLA
Ehrets, J. R, and David W Fischer. Fifth International Williston Basin Symposium: Core Workshop Volume. Miscellaneous Series. [Fargo, N.D.?]: North Dakota Geological Survey, 1987
APA, 7th edition
Ehrets, J. R, & Fischer, D. W. (1987). Fifth International Williston Basin Symposium: core workshop volume. Miscellaneous series. [Fargo, N.D.?]: North Dakota Geological Survey
Chicago, 17th edition
Ehrets, J. R., and David W Fischer. Fifth International Williston Basin Symposium: core workshop volume. Miscellaneous series. [Fargo, N.D.?]: North Dakota Geological Survey, 1987