APA (7e ed.) Bronvermelding

AECOM (Firm). (2018). Spon's external works and landscape price book: 2018 (Thirty-seventh edition.). CRC Press.

Chicago (17e ed.) Bronvermelding

AECOM (Firm). Spon's External Works and Landscape Price Book: 2018. Thirty-seventh edition. London: CRC Press, 2018.

MLA (9e ed.) Bronvermelding

AECOM (Firm). Spon's External Works and Landscape Price Book: 2018. Thirty-seventh edition. CRC Press, 2018.