Welch, Joseph N.
Houghton Miffiln, 1956
Buku Teks
Knickerbocker, K.L. (Kenneth Leslie)
Holt, Rinehart and Winston, 1963
Buku Teks
Kaufmann, Magdalena
Springer, 2012
eBooks
K.L. Knickerbocker ... [and others]
Harcourt, Brace Jovanovics College Publishers, 1985
Buku Teks
edited by Hasting Donnan
SAGE Publication, 2002
Buku Teks