China official annual report 1981
Hongkong Kingsway International Publications 1981
 Buku Referensi
Annual report and statement of accounts for the year ended 31st December, 1981 / Central Bank of Nigeria
Central Bank of Nigeria , 1982
 Buku Teks
The annual register: a record of world events 1981
edited by H.V. Hodson
Longman, 1982
 Buku Referensi
Annual report 2009 BPPT
Badan Pengkajian dan Penerapan Teknologi, 2009
 Buku Teks
Annual report 1978
Wageningen The Institute , 1979
 Buku Teks