(Author’s last name, Earlier publication date; Later publication date)
Dyer (2009, 2013) reported that leadership and communication is essential for effective communication within a team setting.
OR
Leadership and communication are very intertwined concepts (Dyer 2009, 2013).
Dyer, J 2009, The business communication handbook, 8th edn, Pearson, Frenchs Forest, NSW.
Dyer, J 2013, Communication for business and the professions: strategies and skills, 5th edn, Pearson, Frenchs Forest, NSW.