APA Citation

Armstrong, J. Susquehanna River and Schuylkill River Island surveys by John Armstrong et al.

Chicago Style Citation

Armstrong, John. Susquehanna River and Schuylkill River Island Surveys By John Armstrong Et Al.

MLA Citation

Armstrong, John. Susquehanna River and Schuylkill River Island Surveys By John Armstrong Et Al.

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