Krutch, Joseph Wood
Henry David Thoreau
William Sloane Associates, 1948
 Buku Teks SO
Collected poems of Henry Thoreau
edited by Carl Bode
Johns Hopkins University Press, 1974
 Buku Teks SO
The American pronouncing dictionary of troublesome words
edited by Frank O. Colby
Thomas Y. Crowell, 1950
 Buku Referensi
KBS anaunseo wa hamke baeuneun bareun mal goeunmal = (learn together and KBS announcer) Correct Words, Beautiful Words
Hangukbalsong chulphan, 2010
 Buku Referensi
Mayer, Henry
A son of thunder : Patrick Henry and the American Republic /Henry Mayer
Frnklin Watts, 1986
 Buku Teks SO