Cita APA (7th ed.)

Bolitho, A. R. (1977). Learn English for science. s.n.].

Cita Chicago (17th ed.)

Bolitho, A. R. Learn English for Science. [s.l: s.n.], 1977.

Cita MLA (9th ed.)

Bolitho, A. R. Learn English for Science. s.n.], 1977.