Gaya APA
ELFFERS, J., FLETCHER, J.
().
Tourism Principles and Practice 4th Ed
.
Harlow Pearson Education:
2008.
Gaya MLA
ELFFERS, Joost., FLETCHER, John.
"Tourism Principles and Practice 4th Ed".
Harlow Pearson Education:
2008,
.
Buku Teks.