Washington Association of County Officials, Washington State Association of County Officials, & Municipal Research and Services Center of Washington. Directory of Washington county officials. Washington Association of County Officials : Washington State Association of Counties.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Washington Association of County Officials, Washington State Association of County Officials, và Municipal Research and Services Center of Washington. Directory of Washington County Officials. Olympia, WA: Washington Association of County Officials : Washington State Association of Counties.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Washington Association of County Officials, et al. Directory of Washington County Officials. Washington Association of County Officials : Washington State Association of Counties.