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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington Association of County Officials, Washington State Association of County Officials, و Municipal Research and Services Center of Washington. Directory of Washington County Officials. Olympia, WA: Washington Association of County Officials : Washington State Association of Counties.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington Association of County Officials, et al. Directory of Washington County Officials. Washington Association of County Officials : Washington State Association of Counties.