Brown, K. E., & Obourn, E. (1961). Offerings and enrollments in science and mathematics in public high school 1958: Offerings and enrollments in science and mathematics in public high school 1958. Washington D. C.: U. S. Department of health, education and welfare.
Chicago stil citiranjaBrown, Kenneth E., and Ellsworth Obourn. Offerings and enrollments in science and mathematics in public high school 1958: Offerings and enrollments in science and mathematics in public high school 1958. Washington D. C.: U. S. Department of health, education and welfare, 1961.
MLA stil citiranjaBrown, Kenneth E., and Ellsworth Obourn. Offerings and enrollments in science and mathematics in public high school 1958: Offerings and enrollments in science and mathematics in public high school 1958. Washington D. C.: U. S. Department of health, education and welfare, 1961.