Dill, Marshall
Uiversity of Michigan, 1961
Buku Teks
Kitchen, Martin, author
Blackwell Pub, 2012
Buku Teks
Barraclough, Geoffrey, 1908-1984, author
Basil Blackwell, 1952
Buku Teks
Eisler, Gerbart, author
International Publishers, 1945
Buku Teks
Routledge , 1998
Buku Teks