APA-viite (7. p.)

Planning Resources and Operations Systems, Inc. (1991). Regional Conference on the silk roads sponsored by the UNESCO National Commission of the Philippines. Planning Resources and Operations Systems.

Chicago-viite (17. p.)

Planning Resources and Operations Systems, Inc. Regional Conference on the Silk Roads Sponsored by the UNESCO National Commission of the Philippines. Diliman, Quezon City: Planning Resources and Operations Systems, 1991.

MLA-viite (9. p.)

Planning Resources and Operations Systems, Inc. Regional Conference on the Silk Roads Sponsored by the UNESCO National Commission of the Philippines. Planning Resources and Operations Systems, 1991.