COMPETITION SUCCESS REVIEW. (1991). GENERAL KNOWLEDGE 1990-91 (122.). COMPETITION REVIEW PVT. LTD.
Chicago-viite (17. p.)COMPETITION SUCCESS REVIEW. GENERAL KNOWLEDGE 1990-91. 122. NEW DELHI: COMPETITION REVIEW PVT. LTD, 1991.
MLA-viite (9. p.)COMPETITION SUCCESS REVIEW. GENERAL KNOWLEDGE 1990-91. 122. COMPETITION REVIEW PVT. LTD, 1991.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.