| # | Sources | Type | |
|---|---|---|---|
| Auckland University of Technology | Thesis and Dissertations | ||
| DOAJ | Article | ||
| NDLTD: Networked Digital Library of Theses and Dissertations | Thesis and dissertation | ||
| OAPEN | E-Book | ||
| Universiti Kebangsaaan Malaysia | Journal Article | ||
| Universiti Sains Malaysia | Journal Article | ||
| Universiti Teknologi Malaysia | Journal Article | Thesis | ||
| University of Southampton Institutional Research Repository | Journal Article | ||
| Massachusett Institute of Tecnology Digital Repository | Journal Article |