DOUGAN, S., EVANS, B., MACDONALD, N., GOLDBERG, D., GILL, O., FENTON, K., & ELFORD, J. (2008). HIV in gay and bisexual men in the United Kingdom: 25 years of public health surveillance. Cambridge University Press.

DOUGAN, S., B. G EVANS, N. MACDONALD, D. J GOLDBERG, O. N GILL, K. A FENTON, und J. ELFORD. HIV in Gay and Bisexual Men in the United Kingdom: 25 Years of Public Health Surveillance. Cambridge University Press, 2008.

DOUGAN, S., et al. HIV in Gay and Bisexual Men in the United Kingdom: 25 Years of Public Health Surveillance. Cambridge University Press, 2008.