Praise be to Allah.
Some saheeh reports from the Prophet (peace and blessings of Allaah be upon him) describe duaas that can be recited one hundred times during the day and night, such as that reported by Abu Hurayrah (may Allaah be pleased with him), who said that the Messenger of Allaah (peace and blessings of Allaah be upon him) said, Whoever says Laa ilaaha ill-Allaah wahdahu laa shareeka lah, lahul-mulk wa lahul-hamd wa huwa ala kulli shayin Qadeer (There is no god but Allaah Alone, with no partner or associate; His is the Dominion and His is the Praise, and He is Able to do all things), one hundred times in a day, it will be equivalent (in reward) to freeing ten slaves, and a hundred hasanaat (good deeds) will be recorded for him, and one hundred sayiaat (bad deeds) will be erased from his record; it will be a protection for him from the Shaytaan all that day until evening comes, and nobody can do any better than that except one who does more than that.
(Reported by al-Bukhaari, 3050).
Abu Hurayrah (may Allaah be pleased with him) also reported that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: Whoever says Subhaan Allaah wa bi hamdih (Glory and praise be to Allaah) one hundred times in a day, his sins will be wiped out even if they are like the foam of the sea.
(Reported by al-Bukhaari, 5936).
With regard to trustworthy and reliable books of duaas and dhikr, this is a topic which has been covered in many books, ancient and modern, whether the books deal with this topic on its own or it is included with other material. Some examples are:
Amal al-Yawm wa al-Laylahby al-Nisaa'i, edited by Faarooq Hamaadah
al-Adhkaarby Imaam al-Nawawi, edited by Abd al-Qaadir al-Arnaoot
al-Saheeh al-Musnad min Adhkaar al-Yawm wal-Laylah, published by Daar Ibn Affaan, al-Khobar, Saudi Arabia
Saheeh al-Kalim al-Tayyibby al-Albaani, al-Maktab al-Islami, Beirut, Lebanon
Husn al-Muslimby al-Qahtaani, published by Musasat al-Juraysi, Riyadh, Saudi Arabia.
[Translaters Note: this book is available in English under the title: Fortification of the Muslim through Remembrance and Supplication from the Quraan and the Sunnah, by Saeed ibn Ali ibn Wahf al-Qahtaani]
And Allaah is the Source of strength