Roy Morgan Research Centre & Victorian Government Travel Authority. (1981). Domestic travel in Victoria: April, 1980 - March, 1981. Victorian Government Travel Authority.
Cita Chicago (17th ed.)Roy Morgan Research Centre i Victorian Government Travel Authority. Domestic Travel in Victoria: April, 1980 - March, 1981. Melbourne: Victorian Government Travel Authority, 1981.
Cita MLA (8th ed.)Roy Morgan Research Centre i Victorian Government Travel Authority. Domestic Travel in Victoria: April, 1980 - March, 1981. Victorian Government Travel Authority, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.