APA

The Office for Studies (Beirut), . (1993). Keys of Knowledge. Beirut: Nobilis.

Chicago

The Office for Studies (Beirut), . 1993. Keys of Knowledge. Beirut: Nobilis.

Harvard

The Office for Studies (Beirut), . (1993). Keys of Knowledge. Beirut: Nobilis.

MLA

The Office for Studies (Beirut), . Keys of Knowledge. Beirut: Nobilis. 1993.