Edities
Contact, ISBN 90-254-2106-7
Contact, ISBN 978-90-254-3560-8, 2010
Contact, ISBN 978-90-254-2855-6, 2008
Contact, ISBN 978-90-254-2577-7, 2006
Contact, ISBN 90-254-2675-1, 1990
Contact, ISBN 90-254-1728-0, 2005