Gaya APA

Lewis, E, C, S, V, D, ;, G, B, P, ;, J, E. (1979). Land leisure: concepts and methods in outdoor recreation (ed. 2). : .

Gaya MLA

Lewis, Ed., Carlton, S., Van, Doren, ;, George, B., Priddle, ;, John, E.. "Land leisure: concepts and methods in outdoor recreation". ed. 2 : , 1979. .