Historical evolution of trade union and the sources of law - Trade union - Trade union freedom: general aspects - Trade union rights in the workplaces. Trade union representation at company level - Representativeness - Collective agreement: models, framework, efficacy, binding/no binding, mandatory rules - Levels of collective agreements; Legal system and collective bargaining – Collective bargaining in the public sector – Collective agreements in the Public sector - Strike: industrial action. Strike in essential public services. Case law and Constitutional Court - Lockout - Discriminatory and anti-trade unionist behavior of employer.

F. CARINCI, R. DE LUCA TAMAJO, P. TOSI, T. TREU, Diritto del lavoro - Vol. I: Il diritto sindacale, con la collaborazione di P. CAMPANELLA, F. LUNARDON, M. BROLLO, Torino, Utet, 2018

ALTERNATIVELY

G. GIUGNI, Diritto sindacale, aggiornato da L. BELLARDI, P. CURZIO, V. LECCESE, Bari, Cacucci, ult. ed.

In addition it's important a Labour Law Code:
Codice del lavoro, schemi e tabelle a cura di M.T. CARINCI, Milano, Giuffrè, 2018
Codice del lavoro (Editio minor), a cura di L. CIAFARDINI, F. DEL GIUDICE, F. IZZO, Napoli, Ed. Simone, 2019