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