Felix, Jiri
Octopus Books, 1975
Buku Referensi
edited by David O. Norris, Kristin H. Lopez
Elsevier, 2011
Buku Referensi
Pearce-Higgins, James W., author
Cambridge Univ. Press, 2014
Buku Teks
Taylor, Ann
Ragged Mountain Press, 2000
Buku Teks
Miller, Melanie Ann
Garland Publishing, 1986
Buku Referensi