APA (7th ed.) Citation

Youngman, E. P. (1931). Mining laws of Hungary. [publisher not identified].

Chicago Style (17th ed.) Citation

Youngman, E. P. Mining Laws of Hungary. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Youngman, E. P. Mining Laws of Hungary. [publisher not identified], 1931.