Beirão, G, and José António  Sarsfield Cabral. ?Market Segmentation Analysis Using Attitudes Toward Transportation Exploring The Differences Between Men And Women?. Transportation Research Record: Journal Of The Transportation Research Board 2067. Transportation Research Record: Journal Of The Transportation Research Board  (2008): 56-64. doi:10.3141/2067-07.

Beirão, G, and José António  Sarsfield Cabral. ?Understanding Attitudes Towards Public Transport And Private Car: A Qualitative Study?. Transport Policy 14. Transport Policy  (2007): 478-489.

?Understanding Attitudes Towards Public Transport And Private Car: A Qualitative Study?. Transport Policy 14. Transport Policy  (2007): 478-489.

Beirão, G, and José António  Sarsfield Cabral. ?The Reaction Of The Portuguese Stock Market To Iso 9000 Certification?. Total Quality Management 13. Total Quality Management  (2002): 465-474.