1. AATA 1996 Animal Transportation Association manual for the transportation of live animals by road. Section 17.11.4 77
2. AGRICULTURE CANADA 1984 Recommended code of practice for care and handling of pigs
3. BARTON GADE , P. BLAABJERG , L. CHRISTENSEN , L. 1993 Interim Report on Results of Project AIR-PL 920262 [see Warriss (1995) Meat Focus International 4, 491]