1. Modern railway track;Esveld,2001
2. RFI SpA. Capitolato generale tecnico di appalto delle opere civili, parte II - sezione 17, pietrisco per massicciata ferroviaria. 1st ed. Rome: RFI SpA; 2022.
3. CEN. EN 13450, Aggregates for railway ballast. 1st ed. Brussels: CEN; 2002.
4. AREMA. Manual for Railway Engineering, Vol. I – IV. 1st ed. Lanham: AREMA; 2022.
5. UIC. Code 719, Railway Application. Track & Structure. Earthworks and track bed layers for railway lines. Design and construction principles. 1st ed. Paris: UIC; 2020