Παραπομπή APA

(1961). Bitumen felt roof coverings. London: The Council for Codes of Practice British Standards Institution.

Παραπομπή Chicago Style

Bitumen Felt Roof Coverings. London: The Council for Codes of Practice British Standards Institution, 1961.

Παραπομπή MLA

Bitumen Felt Roof Coverings. London: The Council for Codes of Practice British Standards Institution, 1961.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.