Barnard, C. S., & Halley, R. I. A. (1970). Milk production. ILIFFE Books Ltd.
Lua i Stíl Chicago (17ú heag.)Barnard, Christopher S., agus R.J. II.Scott A.H Halley. Milk Production. London: ILIFFE Books Ltd, 1970.
Lua MLA (9ú heag.)Barnard, Christopher S., agus R.J. II.Scott A.H Halley. Milk Production. ILIFFE Books Ltd, 1970.
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