1.
, . The Ammonoidea of the plenus marls and the middle chalk. London: Palaeontographical society; 1981.
et . The Ammonoidea of the plenus marls and the middle chalk. London : Palaeontographical society, 7 mai 1981
Wright C. W. & Kennedy William James. (1981). The Ammonoidea of the plenus marls and the middle chalk. Palaeontographical society.
Style de citation MLA (8e éd.)Wright C. W. et Kennedy William James. The Ammonoidea of the Plenus Marls and the Middle Chalk. Palaeontographical society, 1981.
Attention : ces citations peuvent ne pas être correctes à 100%.