livre

1991 The Loch Ness monster - the evidence. Aberdeen, Aberdeen University Press.

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MLN

1995 Onza ! The hunt for a legendary cat. Silver City, High-Lonesome Books.

1957 Sirènes et mastodontes. Paris, Robert Laffont : traduction de Mermaids and mastodons.

1998 Monstres marins. Rennes, Editions Ouest-France.

1983 Mysterious America. Winchester, Faber and Faber.

2001  Mysterious America : the revised edition. New York, Paraview Press.

1985 Curious encounters. Winchester, Faber and Faber.

1989 Tom Slick and the search for the Yeti. Boston, London, Faber and Faber.

1999 Cryptozoology A to Z. New York, Fireside.

1999 The field guide to bigfoot, yeti, and other mystery primates worldwide. New York, Avon Books.

1969 The great monster hunt - the story of the Loch Ness Investigation. New York, Gosset and Dunlap.

1999 Mostri del mare. Milano, Gruppo Ugo Mursia.

1974 In search of lake monsters. New York, Coward, McCann and Geoghegan.
1977 A la recherche des monstres lacustres. Paris, Plon : traduction du précédent.

1979 The magic zoo. London, Sphere Books Ltd.