Cita APA (7a ed.)

(1981). FLAT ROOFS Technical Guide (2n ed.). PSA.

Cita Chicago Style (17a ed.)

FLAT ROOFS Technical Guide. 2n ed. Croydon, London: PSA, 1981.

Cita MLA (9a ed.)

FLAT ROOFS Technical Guide. 2n ed. PSA, 1981.