Education statistics for the United Kingdom 1987
London: Her Majesty's Stationary office, 1987,
 Buku Referensi
Statistik persekolahan Departemen Pendidikan dan Kebudayaan 1975
[publisher not identified], 1977
 Buku Teks
Billington, E.W.
The physics of deformation and flow / E. W. Billington and A. Tate
McGraw-Hill International Book Company, 1981
 Buku Teks
Guilford, Joy Paul, 1897-1987
Fundamental statistics in psychology and education
McGraw-Hill , 1978
 Buku Teks
Guilford, Joy Paul, 1897-1987
Fundamental statistics in psychology and education
McGraw-Hill, 1987
 Buku Teks