Gwathmey Siegel & Associates Architects (Corporate Name)

Gwathmey Siegel, 1993: CIP text (Gwathmey Siegel & Associates Architects; founded in 1969; New York-based firm) book, p. 298-309 (1964: Charles Gwathmey, Architect; 1966: Gwathmey & Henderson, Architects [no publs. in LC database]; 1968: Gwathmey, Henderson, and Siegel Architects [no publs. in LC database]; 1969: Gwathmey Siegel Architexts; 1978: Gwathmey Siegel & Associates Architects)

Huls, M.E. Charles Gwathmey and Gwathmey Siegel Associates, 1987: in list of bibliographies (Gwathmey Siegel and Associates; Gwathmey Siegel Architects; Gwathmey Siegel)