APA
NOTES ON APPLIED SCIENCE NO. 28, . (1961). THE MEASUREMENT OF FREQUENCY. : H.M.S.O.
Chicago
NOTES ON APPLIED SCIENCE NO. 28, . 1961. THE MEASUREMENT OF FREQUENCY. : H.M.S.O.
Harvard
NOTES ON APPLIED SCIENCE NO. 28, . (1961). THE MEASUREMENT OF FREQUENCY. : H.M.S.O.
MLA
NOTES ON APPLIED SCIENCE NO. 28, . THE MEASUREMENT OF FREQUENCY. : H.M.S.O. 1961.