References
Title: Principles of Plant Breeding.
Author: R. W. Allard.
Publisher: John Wiley & Sons, Inc.
Year: 1960 ISBN: 0 471 02310 8
See Chapter 14
Title: Principles of Cultivar Development, Vol 1
Author: W. R. Fehr
Publisher: Iowa Book Year: 1991
ISBN: 0-9635989-0-2
See Chapter 28
Title: Introduction to Plant Breeding
Author: Fred N. Briggs and P. F. Knowles, Editors
Publisher: Reinhold Publishing Corporation
Year: 1967
ISBN: Unavailable