Heading is the part of a letter where you can use abbreviations for the months.

In a date, you never write the months in figures because it may be confusing with the American style.

In the inside address, you can write the title "Messrs" before the name of a firm if it doesn't contain one or more personal names.

In a salutation, you can use "Gentlemen:" if addressing to an American firm.

In a salutation, if you know the name of your correspondent, you can use "Dear Sir/Madam"

In a subject line, you can write the theme of the letter.

The body of the letter is generally organized in paragraphs.

Providing the source of information, making some requirements, giving information about the market may be the aims of the writer.

The most common complimentary close is "Yours faithfully,".

"Yours sincerely," is more formal than "Yours faithfully,"

"Yours sincerely," is in American style.

The name is usually typed above the signature.

The enclosures are the attachments sent with the letter.