Questia The World's Largest Online Library [Электронный ресурс] / Questia Media America. — Электрон. дан. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Internet Explorer 6.0. — <URL:http://www.questia.com/Index.jsp>.
| Period | Read | Copy | Open | Total | |
|---|---|---|---|---|---|
| Year 2011 | 0 | 0 | 0 | 2 | 2 |
| Year 2012 | 0 | 0 | 0 | 3 | 3 |
| Year 2013 | 0 | 0 | 0 | 1 | 1 |
| Year 2014 | 0 | 0 | 0 | 3 | 3 |
| Year 2015 | 0 | 0 | 0 | 17 | 17 |
| Year 2016 | 0 | 0 | 0 | 5 | 5 |
| Year 2017 | 0 | 0 | 0 | 2 | 2 |
| Year 2018 | 0 | 0 | 0 | 7 | 7 |
| Year 2019 | 0 | 0 | 0 | 3 | 3 |
| 2020 | 0 | 0 | 0 | 0 | 0 |
| Year 2021 | 0 | 0 | 0 | 2 | 2 |
| Year 2022 | 0 | 0 | 0 | 5 | 5 |
| Year 2023 | 0 | 0 | 0 | 23 | 23 |
| Year 2024 | 0 | 0 | 0 | 20 | 20 |
| Total | 0 | 0 | 0 | 93 | 93 |