Kofort, Carl B. (1953): The California Condor. Dover Publications, Inc., New York. Plate 11
Kofort, Carl B. (1953): The California Condor. Dover Publications, Inc., New York. Plate 29
Smith, Dick; Easton, Robert ((1964): California Condor. Vanishing America. McNally and Loftin, Publishers, Charlotte, Santa Barbara. pp. 52/53
Smith, Dick; Easton, Robert ((1964): California Condor. Vanishing America. McNally and Loftin, Publishers, Charlotte, Santa Barbara. p. 55
Smith, Dick; Easton, Robert ((1964): California Condor. Vanishing America. McNally and Loftin, Publishers, Charlotte, Santa Barbara. p. 62
Smith, Dick; Easton, Robert ((1964): California Condor. Vanishing America. McNally and Loftin, Publishers, Charlotte, Santa Barbara. p. 59
Kathrin and Feast 