APA (7th ed.) Citation

Williams, H. S. (1913). Recurrent tropidoleptus zones of the upper Devonian in New York. Govt. Print. Off..

Chicago Style (17th ed.) Citation

Williams, Henry Shaler. Recurrent Tropidoleptus Zones of the Upper Devonian in New York. Washington: Govt. Print. Off., 1913.

MLA (8th ed.) Citation

Williams, Henry Shaler. Recurrent Tropidoleptus Zones of the Upper Devonian in New York. Govt. Print. Off., 1913.

Warning: These citations may not always be 100% accurate.