Nicholson, Max, author
Penguin Books, 1970
Buku Teks
Hally, M. Bernard Dette
Elsevier, 2009
Buku Teks
Richard Mabey, editor
Penguin , 1991
Buku Referensi
Frost, Lee, author
Amphoto Books, 2011
Buku Referensi
edited by Geoffrey Grigson
Penguin Books , 1982
Buku Teks