Gaya APA

Lansing, J, B., Lilienstein, E. (1963). The Travel Market 1955, 1956, 1957 . Michigan: Institute for Social Research Universityof Michigan.

Gaya MLA

Lansing, John, B., Lilienstein, Ernest. "The Travel Market 1955, 1956, 1957". Michigan: Institute for Social Research Universityof Michigan, 1963. Text.