APA (7th ed.) Citation

Klein, B. T. (1975). Guide to American scientific and technical directories (2d ed.). Todd Publications.

Chicago Style (17th ed.) Citation

Klein, Barry T. Guide to American Scientific and Technical Directories. 2d ed. Rye, N.Y.: Todd Publications, 1975.

MLA (9th ed.) Citation

Klein, Barry T. Guide to American Scientific and Technical Directories. 2d ed. Todd Publications, 1975.