(2004). The human factors of transport signs. CRC.
Chicago-viite (17. p.)The Human Factors of Transport Signs. CRC, 2004.
MLA-viite (8. p.)The Human Factors of Transport Signs. CRC, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.
(2004). The human factors of transport signs. CRC.
Chicago-viite (17. p.)The Human Factors of Transport Signs. CRC, 2004.
MLA-viite (8. p.)The Human Factors of Transport Signs. CRC, 2004.