Gaya APA
Sadler, Philip. (2001).
Leadership .
New Delhi:
Crest Publ. House.
Gaya Chicago
Sadler, Philip.
Leadership.
New Delhi:
Crest Publ. House,
2001.
Buku.
Gaya MLA
Sadler, Philip.
Leadership.
New Delhi:
Crest Publ. House,
2001.
Buku.
Gaya Turabian
Sadler, Philip.
Leadership.
New Delhi:
Crest Publ. House,
2001.
Buku.