(1990). Cisco networking academy. [S.l.]: [s.n.].
Trích dẫn kiểu ChicagoCisco Networking Academy. [S.l.]: [s.n.], 1990.
ציטוט MLACisco Networking Academy. [S.l.]: [s.n.], 1990.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.
(1990). Cisco networking academy. [S.l.]: [s.n.].
Trích dẫn kiểu ChicagoCisco Networking Academy. [S.l.]: [s.n.], 1990.
ציטוט MLACisco Networking Academy. [S.l.]: [s.n.], 1990.