Cambridge University Press, 2019
eBooks
Hooker, M. B., author
Clarendon Press, 1978
Buku Teks
Quarterly, 1988
Majalah, Jurnal, Buletin
edited by Paul E. Schellinger, Robert M. Salkin
Toppan, 1996
Buku Referensi
edited by Amanda Spink, Diljit Singh
Emerald, 2012
Buku Teks