Gaya APA

Developing Skills. (1973). London: [s.n.].

Gaya Chicago

Developing Skills. ; 5. London: [s.n.], 1973. Text.

Gaya MLA

Developing Skills. ; 5. London: [s.n.], 1973. Text.

Gaya Turabian

Developing Skills. London: [s.n.], 1973. Print.