Cita APA (7th ed.)

(1973). Integrated science worksheets (4th ed.). Heinemann Educational Books (Asia).

Cita Chicago (17th ed.)

Integrated Science Worksheets. 4th ed. Kuala Lumpur: Heinemann Educational Books (Asia), 1973.

Cita MLA (9th ed.)

Integrated Science Worksheets. 4th ed. Heinemann Educational Books (Asia), 1973.