APA

Shimer G. W., Shrock R. R., . (1955). Index of Fossils North America. : John Wiley & Sons, Inc.

Chicago

Shimer Grabau W, Shrock Robert R, . 1955. Index of Fossils North America. : John Wiley & Sons, Inc.

Harvard

Shimer G. W., Shrock R. R., . (1955). Index of Fossils North America. : John Wiley & Sons, Inc.

MLA

Shimer Grabau W, Shrock Robert R, . Index of Fossils North America. : John Wiley & Sons, Inc. 1955.