Edwards PET, Parsons GR, Myers KH. The economic value of viewing migratory shorebirds on the Delaware Bay: an application of the single-site travel cost model using on-site data. Hum Dimens Wildl. 2011;16(6):435-44. doi: 10.1080/10871209.2011.608180
Longfield JN, Townsend TR, Cruess DF, Stephens M, Bishop (Johannes) C, Bolyard C, Hutchinson E. Methicillin-resistant Staphylococcus aureus (MRSA): risk and outcome of colonized vs. infected patients. Infect Control. 1985 Nov;6(11):445-50. doi: 10.1017/S0195941700064791
Cann CI, Fried MP, Rothman KJ. Epidemiology of squamous-cell cancer of the head and neck. Otolaryngol Clin N Am. 1985 Aug 1;18(3):367-88.