Dr. Kumarpal Parmar. “ગ્રંથાલયમાં ટપાલ-ટીકીટોનું મહત્વ અને તેની જાળવણીઃ એક સૂચન”. Vidhyayana - An International Multidisciplinary Peer-Reviewed E-Journal - ISSN 2454-8596 8, no. 4 (February 10, 2023). Accessed April 20, 2025. https://j.vidhyayanaejournal.org/index.php/journal/article/view/635.