Gaya APA

Vallen, J, J., VALLEN, G, K. (1974). CHEK-IN CHEK-OUT, FOURTH EDITION (4). : .

Gaya MLA

Vallen, Jerome, J.., VALLEN, GARY, K.. "CHEK-IN CHEK-OUT, FOURTH EDITION". 4 : , 1974. Buku.