I used the pictures of the following photographers for my own works (in alphabetical order):
 
RICHARD AVEDON: Samuel Beckett I-IV / Ingrid Boulting / William Burroughs I-IV / William Casby / Dao Dua (The Coconut Monk) / Bob Dylan / R. Buckminster Fuller / Jean Genet / Hand (von Penelope Tree) / Janis Joplin / Louise Nevelson II / Penelope Tree / Viva (Janet Sue Hoffmann) / Andy Warhol III
ERWIN BLUMENFELD: Juliette Gréco / Charlotte Kohler / Manina I-II / Mannequin I-III / Muth / Nude II / Portrait of a Woman
VI-X / Leslie Redgrave / Georges Rouaul / Bruno Walther
BRASSAI: Henri Michaux I-IV
JOSEF BREITENBACH: Edith d´Amara / Max Ernst I-IV / Wassily Kandinsky I-IV / Richard Revy / Sheila
MARTIEN COPPENS: Trans-MUH-tation
JOHN DEAKIN: Francis Bacon / Francis Bacon I-IV
MANFRED FÖRSTER: Claudia Schink I-IV
GISÉLE FREUND: Virginia Woolf
PETER H. FÜRST: Mary Bauermeister I-III
TIMOTHY GREENFIELD-SANDERS: John Cage
PHILIPPE HALSMAN: Woody Allen / Humphrey Bogart / Marc Chagall / Jean Cocteau I / Le Corbusier / Savador Dali I /
Connie Ford / Aldous Huxley / Grace Kelly / Bertrand Russell / Babra Streisand / Sharon Tate / Tamara Toumanova / Andy Warhol I
ATSUKO IWAMI: Karlheinz Stockhausen I-IV
INGRID VON KRUSE: Georg Baselitz I-IV / Mauricio Kagel I-IV / Günther Uecker I-IV
ANNE LEIBOWITZ: Louise Bourgeois
ROBERT MAPPLETHORPE: Laurie Anderson / Black Buddha / William Burroughs / Katherine Cebrian / Dance / Lynn Davis /
Lucy Ferry / Henry Geldzahler / Grace Jones / Willem de Kooning / Roy Lichtenstein / Roy Lichtenstein I-IV / Lilies / Lisa Lyon / Robert Mapplethorpe / Ken Moody / Louise Nevelson I / Isamu Noguchi / Orchids / Roses / Isabella Rossellini / Robert
Sherman / Lord Snowdon / Donald Sutherland / Tulips / Andy Warhol II / Andy Warhol IV-VIII / Sigourney Weaver 
MARTIN MUNKÀCSI: Playing Children
HELMUT NEWTON: Mick Jagger / Debra Winger
PAUL OUTERBRIDGE: Nude III / Portrait of a Woman XI / Woman on the Beach
MAN RAY: George Braque / Jean Cocteau II / Salvador Dali II / Face / Flowers / Henry Miller / Joan Miró I-IV / Meret Oppenheim / Portrait of a Woman V / Man Ray / Arnold Schönberg / Yves Tanguy
KURT REICHERT: Women on Beach
HERB RITTS: Drew Barrymore / Joseph Fiennes / King Hussein of Jordan / Bill T. Jones / Madonna / Elizabeth Taylor
MICHAEL RUETZ: Joseph Beuys I-IV
ERIC SCHAAL: Oskar Kokoschka / Igor Strawinsky
DETLEV SCHNEIDER: Barbara Auer / Heike Makatsch / Christoph Schlingensief
DAVID SEIDNER: Francesco Clemente I-III / Chuck Close I- III
JOHN SWANNELL: Portrait of a Woman XII
PAUL SWIRIDOFF: Markus Lüpertz I-III
UNKNOWN: Sri Aurobindo I-IV (S.A. International Centre of Education, Pondicherry) / Dalai Lama I-IV / René Magritte I-IV / Gustav Meyrink I-IV / Luigi Nono I-IV
PAN WALTHER: Fritz Grotzky / Prof. Kretschmer / Rolf Krause / Charles Lewis / Portrait of a Woman I-III