Varley, M. E. (1967). British freshwater fishes: Factors affecting their distribution. Fishing News Books.
Citazione stile Chigago Style (17a edizione)Varley, Margaret E. British Freshwater Fishes: Factors Affecting Their Distribution. Londres: Fishing News Books, 1967.
Citatione MLA (9a ed.)Varley, Margaret E. British Freshwater Fishes: Factors Affecting Their Distribution. Fishing News Books, 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.