Speck, F. G., Hardenbrook, L., Greywacz, K. B., Howells, W. W., Launer, P., Rathbone, P. T., . . . Caldwell, J. R. (1915). Eastern North America materials, Frank G. Speck Papers.
Chicago Style (17th ed.) CitationSpeck, Frank G., et al. Eastern North America Materials, Frank G. Speck Papers. 1915.
MLA (9th ed.) CitationSpeck, Frank G., et al. Eastern North America Materials, Frank G. Speck Papers. 1915.
Warning: These citations may not always be 100% accurate.