Umdatul ahkaam – Salaah – 68 – Rulings on Rows in Salaah – part 1
Umdatul ahkaam – Salaah – 69 – 71 – Rulings on Rows in Salaah – part 2
Source: Umdatul Ahkaam – Book of Salaah – Dr. Saleh as Saleh [Audio|En]
Islamic Knowledge – Islam, Sunnah, Salafiyyah