Sri:
Sri ramanujaya Namah:
Sri Nigamahantha desikaya namah:
Sri Lakshmi Narasimha paramatmane Parabrahmane namah:
Swamin,
You can use " ARCHAKAR THUNAIVAN", Jayakhya Samhitha bagavatharadana PRayogam, From AANDAVAN AASHRAM PUBLICATIONS,
and "SRI PATHMA TANTRA PRAYOGAM" from Mylapore sri vedanta desika devasthanams. theese All are nice books very easyto learn.
Adiyen
SRI PANCHARATHRA KESAVA BHATTER.