Guinness Word Records, 2002
Buku Referensi
Franks, Patricia C., 1945-, author
ALA Neal-Schuman, 2018
Buku Teks
Shen, Fu, author
Yilin Press, 2006
Buku Teks
Baily, Peter, author
Gover Press, 1974
Buku Teks
The Massachusetts Institute of Technology , 1973
Buku Teks