Adsorption at the gas-solid and liquid-solid interface: proceeding of an International Symposium held in Aix-en-provence (September 21-23, 1981)
edited by J. Rouquerol and K.S.W Sing
Elsevier, 1982
 Buku Teks SO
China official annual report 1981
Hongkong Kingsway International Publications 1981
 Buku Referensi
Algorithmic Language: proceeding of The International Symposium on Algorithmic Language (Amsterdam, The Netherland: 26-29 October 1981)
Nort Hollland Publishing, 1981
 Buku Teks SO
The annual register: a record of world events 1981
edited by H.V. Hodson
Longman, 1982
 Buku Referensi
1981 annual report P.T. Eternit Gresik
Jakarta P.T. tsb. 1981,
 Buku Teks