Web-Based Book Borrowing Information System for the Library of Universitas Nahdlatul Ulama Sumatera Barat with QR Code and WhatsApp Notification Features. TOFEDU [Internet]. 2026 Oct. 26 [cited 2026 Nov. 2];5(3):5818-22. Available from: https://journal.tofedu.or.id/index.php/journal/article/view/2364