Boyd, Andrew
Frederick A Praeger , 1962
Buku Teks
Griffiths, Ieuan Ll., author
Routledge, 1994
Buku Teks
Boyd, Andrew
Frederick A. Praeger Publishers, 1959
Buku Teks
Boyd, Andrew
Methuen, 1985
Buku Teks
Boyd, Andrew, 1920-
Frederick A. Preaeger, 1957
Buku Teks