Gaya APA

Ashford, N, J. (2011). Airport engineering planning, design, development of 21st century airports (Ed. 4). New Jersey: John Wiley & Sons,Inc.

Gaya MLA

Ashford, Norman, J.. "Airport engineering planning, design, development of 21st century airports". Ed. 4 New Jersey: John Wiley & Sons,Inc, 2011. Text.