APA (7e ed.) Bronvermelding

Não informado. (2019). Building Digest. Leonard Hill Technical Group.

Chicago (17e ed.) Bronvermelding

Não informado. Building Digest. London: Leonard Hill Technical Group, 2019.

MLA (8e ed.) Bronvermelding

Não informado. Building Digest. Leonard Hill Technical Group, 2019.

Let op: Deze citaties zijn niet altijd 100% accuraat.