Wellman, D M; Pierce, E M; Vermeul, V R; Mattigod, S V; Richards, E L; Williams, M D; Fruchter, J S; Icenhower, J P Nova Science Publishers Inc 2008 Pehmeäkantinen kirja
Avery, C P (Charles Pumpelly) 1818; Norton, S H (Samuel H ) 1817-1857; Hosmer, W H C (William Howe Cuyler) Creative Media Partners, LLC 2021 Pehmeäkantinen kirja