This are books by Shafi’i scholars, rahimahumullah, from which rulings are decided in Fiqh according to the school of Imam al-Shafi’i, radiyallahu ta’ala anhu.

1) Tuhfatul Muhtaj – Al-Hafidh Ibn Hajar al-Haitami
2) Nihayatul-Muhtaj – Imam Al-Ramli
3) Mughni-Muhtaj – Khatib Sharbini
4) Hasyiah qalyubi wal umairah ‘ala sharhil minhaj
5) Fathul Wahhab – Sheikhul Islam Zakariyya al-Ansari
6) Syarah mahalli ‘ala Minhaj
7) Al-Iqna – Khatib Sharbini
Fathul-Qariib
9) I’anatut-Talibiin – Sh. Abu Bakar Syata
10) Al-Majmu’ – Imam Muhyiddin An-Nawawi
11) Raudatut-Talibiin – Imam Muhyiddin An-Nawawi
12) At-Tahrir – Sheikhul Islam Zakariyya al-Ansari
13) Fathul Jawwad
14) Fatawa al-Kubra
15) Syarah Ubab
16) Minhajul Qawim

This reference is taken from IslamAwareness website