P J S Olney. (1979). 1979 international zoo yearbook V.19. London.
Chicago Edition CitationP J S Olney. 1979 International Zoo Yearbook V.19. London, 1979.
MLA Edition CitationP J S Olney. 1979 International Zoo Yearbook V.19. London, 1979.
Warning: These citations may not always be 100% accurate.