Saini, Dinesh Kumar; Yadav, Arun Kumar; Sharma, Kartik: 'Mnemonics in e-learning using augmented reality' (Computing, 2021), 'E-learning Methodologies: Fundamentals, technologies and applications', Chap. 10, pp. 215-233, DOI: 10.1049/PBPC040E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1cpvk0vkkuh5i.x-iet-live-01content/books/10.1049/pbpc040e_ch10