Stafford, J.

New York Harcourt, Brace and Company 1944

 Buku Teks

edited by Keith Banister, Andrew Campbell

Grolier International, 1993

 Buku Referensi

Roald Otnes, Alfred Asterjadhi, Paolo Casari, Michael Goetz, Thor Husoy, Ivor Nissen, Knut Rimstad, Paul van Walree, Michele Zoezi, editors

[Springer, Springer], 2012

 eBooks

Draminska, Alicja

Draminski S.A., 2016

 Buku Referensi

Wilson, John Dover, 1881-1959

Brooklyn, N.Y. :Haskell House Publisher, 1977,

 Buku Teks