Lockwood, S. C. (1971). Augustine Heard and Company, 1858-1862: American merchants in China. East Asian Research Center, Harvard University; distributed by Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Lockwood, Stephen Chapman. Augustine Heard and Company, 1858-1862: American Merchants in China. Cambridge: East Asian Research Center, Harvard University; distributed by Harvard University Press, 1971.
Lua MLA (8ú heag.)Lockwood, Stephen Chapman. Augustine Heard and Company, 1858-1862: American Merchants in China. East Asian Research Center, Harvard University; distributed by Harvard University Press, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.