Cita APA

US. Congress. (1968). Official congressional directory: For the use of the United States Congress ; closing date for compiling directory material, December 15, 1967. United States Government Printing Office.

Citación estilo Chicago

US. Congress. Official Congressional Directory: For the Use of the United States Congress ; Closing Date for Compiling Directory Material, December 15, 1967. Washington: United States Government Printing Office, 1968.

Cita MLA

US. Congress. Official Congressional Directory: For the Use of the United States Congress ; Closing Date for Compiling Directory Material, December 15, 1967. United States Government Printing Office, 1968.