De Toonklok, by Peter Schat. 
Meulenhof/Landshof. 

The Tone Clock, by Peter Schat. 
Contemporary Music Studies: Volume 7,  
Harwood academic publishers USA. 

"Thesaurus of scales and melodic patterns",  
by Nicolas Slonimsky. 
McMillan Publishing Company NY. 

article: 
De Toonklok van Peter Schat, by Andre Douw. 
Entre'Act no 6, aug. 1992. 

poems: 
The Brooklyn Branding Parlors, by James Purdy. 
Polak & van Gennep, 1990. 

Poeta en Nueva York, Frederico Garcia Lorca. (1929-1930). 
New Direction Publishing corp.