Dyfyniad APA

Lawrence, W. J. C. (1951). Practical plant breeding (3.). George Allen & unwin ltd.

Dyfyniad Arddull Chicago

Lawrence, W J C. Practical Plant Breeding. 3. London: George Allen & unwin ltd, 1951.

Dyfyniad MLA

Lawrence, W J C. Practical Plant Breeding. 3. George Allen & unwin ltd, 1951.

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