APA (7th ed.) Citation

United States. Federal Board for Vocational Education. (1919). Unit course: Arithmetic I, for men of limited elementary education, trial edition. GPO.

Chicago Style (17th ed.) Citation

United States. Federal Board for Vocational Education. Unit Course: Arithmetic I, for Men of Limited Elementary Education, Trial Edition. [Washington]: GPO, 1919.

MLA (9th ed.) Citation

United States. Federal Board for Vocational Education. Unit Course: Arithmetic I, for Men of Limited Elementary Education, Trial Edition. GPO, 1919.