Macleod, Dianne Sachko. «Stephens, Frederic George». Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/36272. (Subscription or UK public library membership required.)
Macleod, Dianne Sachko. «Stephens, Frederic George». Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/36272. (Subscription or UK public library membership required.)