Popham, E. L., & Ettinger, B. (1976). Opportunities in office occupations (Rev. ed.). Louisville, Ky.: Vocational Guidance Manuals.
Чикагска система за цитиранеPopham, Estelle L., и Blanche Ettinger. Opportunities in Office Occupations. Rev. ed. Louisville, Ky.: Vocational Guidance Manuals, 1976.
MLA формат за цитиранеPopham, Estelle L., и Blanche Ettinger. Opportunities in Office Occupations. Rev. ed. Louisville, Ky.: Vocational Guidance Manuals, 1976.
Внимание: Тези цитати може да не са 100% точни.