Landmark
Hungarian writerss on thirty years of history
[T.t.] Corvina Press [t.th.]
 Buku Teks
Cambridge, Ada. 1844-1926
Thirty years in Australia / Ada Cambridge
New South Wales University Press, 1989
 Buku Teks
Hu, Chiao-Mu
Thirty years of the communist party of China
Foreign Languages Press, 1952
 Buku Teks
China and New Zealand : a thriving relationship thirty years on
edited by James Kember
New Zealand Asia Institute, 2003
 Buku Teks
Rob, Golding
Mini thirty-five years on/Rob Golding
The Bath Press, Avon, 1994
 Buku Teks