APA

The Offical Handbook, . (1973). The ulster year book. Reino Unido: Belfast.

Chicago

The Offical Handbook, . 1973. The ulster year book. Reino Unido: Belfast.

Harvard

The Offical Handbook, . (1973). The ulster year book. Reino Unido: Belfast.

MLA

The Offical Handbook, . The ulster year book. Reino Unido: Belfast. 1973.