Her Majesty's Stationery Office, 1973
Buku Referensi
Reynolds, James E. F.
The Pharmaceutical Press, 1993
Buku Referensi
Reynolds, James E. F.
Royal Pharmaceutical Society, 1996
Buku Referensi
Her Majesty's Stationery Office, 1975
Buku Referensi
KAT International Marketing Service, 1972
Buku Referensi