See Allo

edited by George T. Crane and Abla Amawi

Oxford University Press, 1997

Buku Teks

edited by Beth A. Simmons and Richard H. Steinberg

Cambridge University Press, 2006

Buku Teks

Holsti, Kalevi J., author

Prentice-Hall, 1977

Buku Teks

Griffith, Martin, author

Routledge, 2002

Buku Teks

Moon, Parker Thomas, author

Macmillan, 1926

Buku Referensi

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