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Massey, Katharine RRC Revision Guide: NEBOSH Level 6 National Diploma for Occupational Health and Safety Management Professionals: Unit DN3 Do Controlling Workplace Safety Issues (UK)
 Massey, Katharine RRC Revision Guide: NEBOSH Level 6 National Diploma for Occupational Health and Safety Management Professionals: Unit DN3 Do Controlling Workplace Safety Issues (UK)
Massey, Katharine RRC Revision Guide: NEBOSH Level 6 International Diploma for Occupational Health and Safety Management Professionals: Unit DI1 Know -Workplace Health and Safety Principles (International)
 Massey, Katharine RRC Revision Guide: NEBOSH Level 6 International Diploma for Occupational Health and Safety Management Professionals: Unit DI1 Know -Workplace Health and Safety Principles (International)
Massey, Katharine