APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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