| Rank | Domain | Parent Category | Sub Category | Payment | Card |
|---|---|---|---|---|---|
| 2,312 |
|
Reference materials | Reference materials - other | Yes | Yes |
| 198,457 |
|
Reference materials | Reference materials - other | No | No |
| 358,010 |
|
Reference materials | Reference materials - other | No | No |
| 502,021 |
|
Reference materials | Reference materials - other | No | No |
| 594,946 |
|
Reference materials | Reference materials - other | No | No |
| 976,419 |
|
Reference materials | Reference materials - other | No | No |