APA
ROBERT E. DOYLE M. M. P. G. M. G. M. B. G., .ANIMALS IN DANGER. ASHINGTON D.C., NATIONAL GEOGRAPHIC SOCIETY, 1978: .
Chicago
ROBERT E. DOYLE MELVIN M PAYNE GILBERT M GRODVENOR MELVILLE BELL GROSVENOR, .ANIMALS IN DANGER. ASHINGTON D.C., NATIONAL GEOGRAPHIC SOCIETY, 1978: .
Harvard
ROBERT E. DOYLE M. M. P. G. M. G. M. B. G., .ANIMALS IN DANGER. ASHINGTON D.C., NATIONAL GEOGRAPHIC SOCIETY, 1978: .
MLA
ROBERT E. DOYLE MELVIN M PAYNE GILBERT M GRODVENOR MELVILLE BELL GROSVENOR, .ASHINGTON D.C., NATIONAL GEOGRAPHIC SOCIETY, 1978: . .
