Cita APA (7th ed.)

ELDERtON , W. i. P. a. J. l., & ELDERTON, W. P. a. J. l. (1969). Systems of Frequency Curves. C.U. Press.

Cita Chicago (17th ed.)

ELDERtON , W illiam Plain and JOHNSON,Norman lloyd, i William Plain and JOHNSOn,Norman lloyd ELDERTON. Systems of Frequency Curves. Cambridge: C.U. Press, 1969.

Cita MLA (9th ed.)

ELDERtON , W illiam Plain and JOHNSON,Norman lloyd, i William Plain and JOHNSOn,Norman lloyd ELDERTON. Systems of Frequency Curves. C.U. Press, 1969.