APA (7th ed.) Citation

Drake, A. A. (1967). The Martinsburg formation (Middle and Upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey: A clarification of the stratigraphy of clastic rocks of Middle and Late Ordovician age in western New Jersey and eastern Pennsylvania. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Drake, Avery Ala. The Martinsburg Formation (Middle and Upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey: A Clarification of the Stratigraphy of Clastic Rocks of Middle and Late Ordovician Age in Western New Jersey and Eastern Pennsylvania. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1967.

MLA (9th ed.) Citation

Drake, Avery Ala. The Martinsburg Formation (Middle and Upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey: A Clarification of the Stratigraphy of Clastic Rocks of Middle and Late Ordovician Age in Western New Jersey and Eastern Pennsylvania. United States Department of the Interior, Geological Survey, 1967.