National Geographic Magazine
1964 vol.125 No.6 June
1991 vol.179 No.3 March	     
1995 Vol.189 No.1 January 
1996 Vol.189 No.2 February 
1996 Vol.189 No.6 June	
1996 Vol.190 No.1 July 	
1996 Vol.190 No.4 October 
1996 Vol.190 No.5 November 
1996 Vol.190 No.6 December 
1996 Vol.191 No.1 January 
1997 Vol.191 No.2 February 
1997 Vol.191 No.3 March 
1997 Vol.191 No.4 April 
2008 Vol.214 No.5 November
2014 April (German edition)