See Allo

Greenwood, Gordon, 1913-1986, author

McGraw-Hill, 1974

Buku Teks

Davidsen, Soren, author

Kanisius, 2006

Buku Teks

Sitkoff, Harvard, author

Oxford University Press, 2000

Buku Teks

International Society for Educational Information, Inc., 1973

Buku Teks

Bechhoefer, Bernhard G., author

Brookings Institution, 1961

Buku Teks

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