APA-referens (7:e uppl.)

Orchard, T., Thiyagaraja, S., Welsh, K., Wordsworth, B., & Jewell, D. (1998). HLA genes are important phenotype determining genes in the peripheral arthropathies of inflammatory bowel disease (IBD).

Chicago-referens (17:e uppl.)

Orchard, T., S. Thiyagaraja, K. Welsh, B. Wordsworth, och D. Jewell. HLA Genes Are Important Phenotype Determining Genes in the Peripheral Arthropathies of Inflammatory Bowel Disease (IBD). 1998.

MLA-referens (9:e uppl.)

Orchard, T., et al. HLA Genes Are Important Phenotype Determining Genes in the Peripheral Arthropathies of Inflammatory Bowel Disease (IBD). 1998.