Raymond H. Shove ... [and others]
University of Minnesota Press, 1963
Buku Teks
edited by David Baker and Wendy Evans
Emerald, 2017
eBooks
edited by Dawn Lowe–Wincentsen
Chandos, 2015
eBooks
University of Texas Press,
Majalah, Jurnal, Buletin
Prytherch, Ray
Gower, 2000
Buku Referensi