APA
murphy E. C., Nichols D. J, Hoganson J. W & Forsman N. F. (1995). the cretaceous/tertiary boundary in south-central north dakota. north dakota: geological survey.
Chicago
murphy E C, Nichols D. J, Hoganson J. W and Forsman N. F. 1995. the cretaceous/tertiary boundary in south-central north dakota. north dakota: geological survey.
Harvard
murphy E. C., Nichols D. J, Hoganson J. W and Forsman N. F. (1995). the cretaceous/tertiary boundary in south-central north dakota. north dakota: geological survey.
MLA
murphy E C, Nichols D. J, Hoganson J. W and Forsman N. F. the cretaceous/tertiary boundary in south-central north dakota. north dakota: geological survey. 1995.