APA aipamena

KLEINAU KARL- HEINZ & SOMASUNDARAN K. (1973). TELEPHONE PRATISHTAPANAM. KERALA BHASHA INSTITUTE.

Chicago Style aipamena

KLEINAU KARL- HEINZ and SOMASUNDARAN K. TELEPHONE PRATISHTAPANAM. Trivandrum: KERALA BHASHA INSTITUTE, 1973.

MLA aipamena

KLEINAU KARL- HEINZ and SOMASUNDARAN K. TELEPHONE PRATISHTAPANAM. KERALA BHASHA INSTITUTE, 1973.