نَحْوُ: «جَاءَنِي زَيْدٌ نَفْسُهُ، وَالزَّيْدَانِ أَنْفُسُهُمَا أَوْ نَفْسَاهُمَا، وَالزَّيْدُونَ أَنْفُسُهُمْ».
Translation: Examples: Zayd himself came; the two Zayds themselves came (anfusuhumā or nafsāhumā); and the Zayds themselves came (anfusuhum).
The book explicitly gives two forms for the dual: anfusuhumā and nafsāhumā. The attached humā refers to two people; hum to a masculine plural.